(opened after Firebug installation or update)as for update... firstrun page?..
Install - ok. Update - why?.. I'm know, that FB is best development plugin :)
You can set: extensions.firebug.showFirstRunPage to false to avoid the page,
today - remember. two day or week ago - forget. Uncomfortable...
The first-run page is actually our blog, which contains info about what's new in each version.
I think this information is required only plugin's "fanatics". Ordinary users, like me, just use and enjoy.
So do not agree with the fact that it can not be disabled in the settings menu. And only through the awkward command line.