mozilla.dev.tech.plugins Google Group

Re: Multiprocess plug-ins, is this integrity levels yet?

benja...@smedbergs.us (Benjamin Smedberg) — Sat, 19 Dec 2009 16:46:10 UT

No.
We don't have immediate plans for any sort of sandbox for plugin processes,
although we'd like to explore it in the future. That will require
cooperation from plugin vendors, since the major plugins currently read and
write data from the system in pretty arbitrary ways.
--BDS

Re: Array of Objects

taxil...@gmail.com (taxilian) — Sat, 19 Dec 2009 10:10:48 UT

this actually is not too hard. I want to first add something to the
previous post; while NPN_Evaluate does get the job done, it would
really be better to just call NPN_Invoke(npp, windowobject,
NPN_GetStringIdentifier("Array "), ...)
The reason is that firefox seems to handle things differently when you

Multiprocess plug-ins, is this integrity levels yet?

jamesraymondgent...@gmail.com (James Gentile) — Sat, 19 Dec 2009 04:36:25 UT

Is the new multi-process stuff based on Windows integrity levels, or
does it use them to run firefox sandboxed? If not, will this EVER be
added?

Re: Regarding Multi-Process Plugins

georg.fritzs...@googlemail.com (Georg Fritzsche) — Fri, 18 Dec 2009 14:34:58 UT

Sorry, didn't know that.
Georg

Re: Array of Objects

movewr...@googlemail.com (Digambar Rasal) — Fri, 18 Dec 2009 10:25:24 UT

Looks good now. I have figured out how to return Array of objects
defined in plugin which can't be created from Javascript.
Say Object - Note which has date and string as properties. From
JAVAScript, there is call to get complete list of notes. So Plugin
need to create object big enough to hold all notes with

Re: Array of Objects

benja...@smedbergs.us (Benjamin Smedberg) — Thu, 17 Dec 2009 15:54:59 UT

An Array is just a JS object, so you can script it like any other NPObject.
For example:
To create a new Array object:
* get NPNVWindowNPObject
* call NPN_Evaluate(npp, windowobject, "new Array()", resultvariant);
To fill it with objects:
NPVariant[3] arrayitems;
for (int i = 0; i < 3; ++i) {
NPIdentifier id = NPN_GetIntIdentifier(i);

Array of Objects

movewr...@googlemail.com (Digambar Rasal) — Thu, 17 Dec 2009 15:34:39 UT

Hi,
I am writing scriptable plugin and I am sure lot of people must have
faced similar problem.
I need to pass Array from Javascript and return Array of NPObjects to
Javascript from NPAPI plugin. But there is not documentation about how
this is achieved.
please reply if you think of something or have documentation links or

Re: How to embed an application into Firefox viewport?

benja...@smedbergs.us (Benjamin Smedberg) — Thu, 17 Dec 2009 14:52:35 UT

Well, by posting to the mdt.plugins newsgroup you've mostly answered your
question: you write an NPAPI plugin. The plugin tells the browser what MIME
types it can handle (and also which local file extensions map to those MIME
types), and the browser will instantiate the plugin when the user tries to

Re: Regarding Multi-Process Plugins

benja...@smedbergs.us (Benjamin Smedberg) — Thu, 17 Dec 2009 14:46:55 UT

It's likely to be flash, since that's what youtube uses. Do you have crash
report IDs available?
Georg, I specifically asked early testers of out-of-process plugins to
report issues to this group. Sending them to an end-user support group is
not helpful.
--BDS

Re: Regarding Multi-Process Plugins

georg.fritzs...@googlemail.com (Georg Fritzsche) — Thu, 17 Dec 2009 12:49:15 UT

Try posting in mozilla.support.firefox.
Georg

xulrunner 1.9.1.4 and Adobe Flash Plugin problem

tj...@dds.invalid (tjoen) — Thu, 17 Dec 2009 07:42:35 UT

I had posted the question in dev.support.firefox but no answers.
System: a DIY Linux x86
Gnome 2.28.1
xulrunner 1.9.1.4 with .mozconfig:
mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/objdir
mk_add_options MOZ_CO_PROJECT=xulrunner
ac_add_options --prefix=/usr
ac_add_options --with-system-nspr
ac_add_options --with-system-nss

Regarding Multi-Process Plugins

vid...@gmail.com (Vids) — Thu, 17 Dec 2009 04:35:59 UT

After enabling the Multi-Process Plugins, my youtube crashes very
often. I am not sure which plugin is triggering this..

Re: Any example of writing an NPAPI plugin in Linux?

georg.fritzs...@googlemail.com (Georg Fritzsche) — Tue, 15 Dec 2009 17:00:32 UT

Depends on what you want to.
The basic NPAPI samples build on Linux too:
[link]
For IPC it depends on your use-case, though Boost.Interprocess or D-
Bus come to mind.
Georg

Any example of writing an NPAPI plugin in Linux?

zel...@gmail.com (ZelluX) — Tue, 15 Dec 2009 12:04:10 UT

Hi, all
I need to write a browser plugin to communicate with another process,
and it seems I have to use NPAPI plugins. Is there any example or open
source NPAPI plugin I can refer to?
Many thanks for your reply.

Re: mozilla plugin on mac

emann...@gmail.com (enda man) — Mon, 14 Dec 2009 14:10:28 UT

I might as well answer my own post as I could be waiting and waiting
for someone else to do so...
Two things I needed to do to make it work on the mac to get it to load
in Firefox.
1. build using 32-bit architecture -arch i386
2. Deliver info.plist resource file with the plugin.
EM

Re: How To get the plugin Installation Path?

luca.cerutti...@gmail.com (Luca Cerutti) — Mon, 14 Dec 2009 13:59:43 UT

On 11 Dic, 18:21, Georg Fritzsche <georg.fritzs...@googlemail.co m>
wrote:
Thank you Greg...
I must also thank Martin that privately pointed to me the fact that
registry functions SHOULD work.
Checking my code again I've discovered a bug... the weird fact is that
the error shoud have been severe enough to cause a crash, but instead

Re: NPObject to NPObject initilization

taxil...@gmail.com (taxilian) — Sat, 12 Dec 2009 18:06:03 UT

Yes; the method I mentioned only works with objects that you
create. :-) NPN_Invoke and NPN_SetProperty will work on any
NPObject. I tend to be obsessively object oriented, but I'd probably
still create an object or method somewhere that takes the NPObject
params, creates the object, calls the appropriate initialization

Re: How To get the plugin Installation Path?

georg.fritzs...@googlemail.com (Georg Fritzsche) — Fri, 11 Dec 2009 17:21:24 UT

You can use GetModulePath(GetModuleHandle( ), ...) on Windows.
Regards,
Georg

How To get the plugin Installation Path?

luca.cerutti...@gmail.com (Luca Cerutti) — Fri, 11 Dec 2009 17:03:18 UT

Good Day,
I need to know how a plugin can know the path to the folder where it
is installed.
I'm targeting MicroSoft Windows as OS and as far as I know, NPAPI has
no methods to read registry values and any call to Microsoft SDK
registry functions immediately disables the plugin.
Obviously "GetCurrent" only gets the installation path of Mozilla

mozilla plugin on mac

emann...@gmail.com (enda man) — Fri, 11 Dec 2009 15:07:08 UT

Hi,
I can not get firefox on mac osx 10.6 to load the npcomplex sample I
built. I drop the plugin file called libnpcomlex.dylib into ~/Library/
Internet Plug-Ins
Do I need an Info.plist file for this to work.
By not loading I mean I do not see it when I type about:plugins in the
browser URL.
EM

Re: NPObject to NPObject initilization

movewr...@googlemail.com (Digambar Rasal) — Fri, 11 Dec 2009 09:20:51 UT

I think I need to use NPN_Invoke on new object to call default which
initialises method with parameters. But thanks for reply. I find its
very easy to do with JS Objects which my platform doesn't support.
Cheers

Re: NPObject to NPObject initilization

taxil...@gmail.com (taxilian) — Thu, 10 Dec 2009 20:12:39 UT

I'm not sure if anyone can say that there is a "Best way", but I can
tell you how I normally do it. I just have a static method on my
NPObject class called "NewObject"; I pass in my browser object (which
has the pointers to NPN_CreateObject and the NPP handle) as well as
any initialization parameters that I may need and it returns the

NPObject to NPObject initilization

movewr...@googlemail.com (Digambar Rasal) — Thu, 10 Dec 2009 18:29:40 UT

In a plugin say video, after initilization of base object, further
objects are created by NPN->CreateObject.
As CreateObject just takes Class variable as arguement, is it
possible to send some initilisation data so that on allocate it can be
used in next class.
Here is snippet -
in main plugin instace -

Re: Flash Player 10 plugin and standard NPAPI

alessandro.cogli...@gmail.com (alessandro) — Thu, 10 Dec 2009 14:24:18 UT

The reason I'm asking this, is that Adobe Flash Player 10 is ready to
receive visibility notifications from browsers to CorePlayer::OnEvent
method (kEventPlayerNotVisible and kEventPlayerVisible).
And for example, Webkit implements MPluginNotifier Class. That class
send visibility and focus notification to plugins.

Flash Player 10 plugin and standard NPAPI

alessandro.cogli...@gmail.com (alessandro) — Thu, 10 Dec 2009 12:56:02 UT

Flash Player 10 has new features and optimizations.
In order to enhance some of the optimizations, browser needs to notify
plugin visibility status to Flash plugin instance. It will be nice
that there will be standard API to handle this issue.
What is the Mozilla policy? Is it possible to extend NPAPI in order to

Need testers for Firebreath cross-browser plugin framework

taxil...@gmail.com (taxilian) — Thu, 10 Dec 2009 07:28:38 UT

All,
Not trying to spam the list, but a few months ago I posted a little
note mentioning an open source project that I had just started called
Firebreath ([link]). Firebreath is
intended to be a cross-platform, cross-browser plugin framework. I
posted before requesting interested developers lend a hand =] Thank

Plugin on OSX

ginofiliber...@yahoo.it (Gino) — Tue, 08 Dec 2009 10:16:04 UT

Good morning everyone.
Does anyone know, if it's possible to use Core Animation in a firefox plugin, or if it's still unsupported? Maybe minefield?
Thanks in advance
G.

Re: Can plugins interpret the HTML script tag?

georg.fritzs...@googlemail.com (Georg Fritzsche) — Fri, 04 Dec 2009 15:42:07 UT

Ok, makes sense that way. I did have something else in my head.
Regards,
Georg

Re: plugin finder service

emann...@gmail.com (enda man) — Thu, 03 Dec 2009 13:50:59 UT

I have exactly the same problem, anyone know know how to bypass this
manual install stage.
EM

Re: Can plugins interpret the HTML script tag?

benja...@smedbergs.us (Benjamin Smedberg) — Tue, 01 Dec 2009 15:23:06 UT

I'm not suggesting hacks here, I'm suggesting an NPAPI extension, so that
<script type="application/x-foo"> would query plugins to see if they handle
that MIME type and invent a new enumeration value for NP_GetValue. Then
you'd load a single windowless plugin instance per page and pass it script

Re: How to get directory in wich plugin is installed (or current profile)

luca.cerutti...@gmail.com (Luca Cerutti) — Tue, 01 Dec 2009 13:48:46 UT

On 13 Nov, 14:16, Oleksandr Shneyder <oleksandr.shney...@obviously-
I've exactly the same question but I'm developing under MS Windows.
I need to know how to read a sort of configuration file for the plugin
because I need to let the plugin read/edit the following information:
- custom cache folder path

manually install plugin

emann...@gmail.com (enda man) — Tue, 01 Dec 2009 13:11:45 UT

Hi,
I wrote a plugin and packaged it into an XPI file. I have the
following tag on my html page used to install the plugin installer.
<object type="application/x-mypluginap p" id="plugin" width="0"
height="0" codebase="webphone.xpi"> </object>
After I navigate to my web page, it detects there is no plugin

Re: Can plugins interpret the HTML script tag?

georg.fritzs...@googlemail.com (Georg Fritzsche) — Mon, 30 Nov 2009 22:15:14 UT

Yes, i said its currently used as a workaround - but thats no reason
to encourage hacks.
And how could something like this work without breaking common NPAPI
behaviour:
<html>
<head><script type="application/x-foo">doX() ;</script></head>
<body><object type="application/x-foo"><!-- this isn't loaded early

Re: Can plugins interpret the HTML script tag?

benja...@smedbergs.us (Benjamin Smedberg) — Mon, 30 Nov 2009 21:02:43 UT

Why not? The NPAPI seems like a pretty good fit for this kind of script
execution, because it has a well-defined object scripting model already.
Flash, for example, is basically a script execution engine already, and
people already use 1x1 hidden flash objects just for its scriptability
(ability to play sounds, for example).

Re: Can plugins interpret the HTML script tag?

georg.fritzs...@googlemail.com (Georg Fritzsche) — Mon, 30 Nov 2009 20:45:15 UT

Correct me if i'm overlooking something, but while there is the need
to utilize the NPAPI as a workaround for such things in the absence of
a cross-browser API for extensions, i don't see how this would fit
into the NPAPI in a official or semi-official way.
The NPAPI is targeted at extended embedded content, but a script-

Re: Can plugins interpret the HTML script tag?

benja...@smedbergs.us (Benjamin Smedberg) — Mon, 30 Nov 2009 15:32:38 UT

That is correct. Although we did add some support for "language agnostic
DOM" for PyXPCOM, I don't think we now consider it important enough to spend
significant energy on it, and so I think we're unlikely to accept changes of
this magnitude (in Mozilla/Firefox anyway).
Actually adding support for <script type="application/x-mycustomsc ripttype">

Re: Google Maps and Adobe Flash

whiteley.mich...@gmail.com (Mike) — Mon, 30 Nov 2009 03:20:00 UT

I had that set up. After several hours (over a week's worth of
searching). It turns out that it's a permissions thing. Even with
allowscriptaccess set to always it wouldn't send invoke commands to a
locally started file. I had to create a dummy URL to return for
top.location. I'm sure there is another way around it, but I couldn't

Re: Can plugins interpret the HTML script tag?

dherr...@at.tentpost.dot.com (D Herring) — Mon, 30 Nov 2009 02:49:53 UT

No. I really meant the <script> tag. Its defintion even hints that
it should support other languages (e.g. tcl or vbscript).
[link]
That is a possible syntax to replace normal <script> blocks. However,
it makes script formatting difficult (e.g. escaping quotes). Also

Re: Can plugins interpret the HTML script tag?

dherr...@at.tentpost.dot.com (D Herring) — Mon, 30 Nov 2009 02:31:38 UT

Portability is one of the main benefits of NPAPI. I'll try stirring
up some support for this feature; but in the meantime, I'll look at a
minimal javascript interface.
Thanks,
Daniel

Re: Can plugins interpret the HTML script tag?

benja...@smedbergs.us (Benjamin Smedberg) — Mon, 30 Nov 2009 01:00:54 UT

Do you mean something like:
<embed type="application/x-myscript">
custom script text here
</embed>
If so, then this won't work, because the way the <embed> tag is specified,
the inner content is displayed when the content type is unknown or
unsupported. You can, however, get it to load external scripts by URL, e.g.

Re: Can plugins interpret the HTML script tag?

georg.fritzs...@googlemail.com (Georg Fritzsche) — Sun, 29 Nov 2009 09:13:10 UT

NPAPI developed historically from use-cases that were most important
back then, see Wikipedia [1] on this.
Its supported not only by Gecko but also by WebKit, Opera and probably
more. As there is no organization that officially defines the NPAPI
you can't just add something to it, only begin supporting it in one

Can plugins interpret the HTML script tag?

dherr...@at.tentpost.dot.com (D Herring) — Sun, 29 Nov 2009 06:56:24 UT

Hi,
I started working on an NPAPI plugin to embed non-javascript languages
into HTML. The idea was to implement a system like FastCGI, but
client-side. When the plugin started, it would start the interpreter
program and use sockets to communicate.
The goal was for this plugin to be able to interpret scripts such as

Re: Google Maps and Adobe Flash

incorrect.us...@gmail.com (iUm) — Mon, 23 Nov 2009 11:11:10 UT

To Mike:
Flash plug-in can get a scriptable object from your application via
NPN_GetValue(... , NPNVWindowNPObject, ...). You should return a real
(maybe you have a javascript engine in your app), or just a virtual
(your own simple implementation) scriptable object. Then the plug-in
will call NPN_Invoke with method name "_DoFSCommand" and exactly 2

Call an extension from a plugin?

bjvet...@gmail.com (bjv) — Fri, 20 Nov 2009 23:32:38 UT

I've read lots of posts about calling JavaScript in pages from plugins
and vice-versa. However, I've got a requirement to call code in an
extension from a plugin. Is this even possible? If that extension is a
collection of JavaScript objects, does that make it harder or easier
(impossible)?

Re: Google Maps and Adobe Flash

incorrect.us...@gmail.com (iUm) — Fri, 20 Nov 2009 12:37:25 UT

Seems, there's a bug in the Adobe Flash plug-in: it depends on
arguments' order, passed to NPP_New.
E.g. to fix that problem with Google Maps i just put "scale"
argument-value pair before "salign" one in NPP_New arguments' list. So,
if "salign" comes before "scale" Street View will be displayed
incorrectly... Nothing similar with Adobe Flash ActiveX, which really

Re: Problem registering a scriptable extension

georg.fritzs...@googlemail.com (Georg Fritzsche) — Thu, 19 Nov 2009 13:57:28 UT

You could try to profile FF with DependencyWalker to see if it at
least loads your DLL.
If it does and your entry points are correctly exported and there are
no missing libraries that your plugin tries to delay-load, it could be
that the version info in the DLL doesn't match the version you
register the plugin with - FF on windows checks that before calling

Re: How to get directory in wich plugin is installed (or current profile)

benja...@smedbergs.us (Benjamin Smedberg) — Mon, 16 Nov 2009 13:34:36 UT

Is this a plugin binary, or an extension? Binary plugins typically don't
know or care where they are installed. For extensions using __LOCATION__
from a JS file is the recommended solution:
[link]
--BDS

Re: How to get directory in wich plugin is installed (or current profile)

oleksandr.shney...@obviously-nice.de (Oleksandr Shneyder) — Mon, 16 Nov 2009 07:23:45 UT

Georg Fritzsche schrieb:
Thank you very much, Georg. That is exactly what I need.
Have a nice day.

Re: How to get directory in wich plugin is installed (or current profile)

georg.fritzs...@googlemail.com (Georg Fritzsche) — Sun, 15 Nov 2009 09:03:07 UT

The GNU extension dladdr() is commonly used for that.
Regards,
Georg

Problem registering a scriptable extension

cctv.s...@gmail.com (rincewind) — Sat, 14 Nov 2009 01:10:39 UT

I'm trying to create an NPAPI plugin, packaged as extension, and so
far I cannot even get my code to run (I put debug breaks in all 3
exported functions: NP_GetEntryPoints, NP_Initialize and NP_Shutdown,
and they haven't been hit).
When I feed Firefox 3.5.5/Windows with an XPI archive, the extension