> > YouTube radically changed when I moved to FireFox.56;
> > so I simply ReWrote the CSS.
>
> Looks like there has also been a spotty history with @document.
"@-moz-document regexp() {}" works a treat; I've no complaints.
The only changes I've seen have -all- been for the better.
Also, HTML.5 works better than 4 -- lots of w3 validator's PseudoErrors
( for "Jeff-Relf.Me" ) vanished this way, with me having to do nothing.
Likely, Google dropped FireFox ( for Chrome )
because FireFox was/is too good at blocking ads.
> > > > My (FireFox.56) "Jeff-Relf.Me/userContent.CSS.TXT" mods YouTube.
> > > > YouTube responds -very- differently to FireFox.42, wow ! different CSS.
> > > > FireFox.58 kills my extensions, so I can't use it.
>
> Are you saying the CSS.TXT that you pointed to is not what you're using ?
No, I'm using it right now, for FireFox.56;
it's just different from what I used for FireFox.42, a big ReWrite .
> Will you show a screenshot of your CSS hacks with YT and Google?
Note how, in the (4k) screenshots below, I get light text on black,
with large, MonoSpaced fonts ( Zooming In&Out is trivial, of course ).
Part of it is: My High Contrast Theme for Windows 10:
Jeff-Relf.Me/Black.Theme.TXT
If something looks wrong, on some random page,
I'll either write some CSS for it
or I'll just open it in Chrome, sans my "userContent.CSS".
Jeff-Relf.Me/Google.PNG
Jeff-Relf.Me/YouTubeSubs.PNG
Jeff-Relf.Me/YouTube.COM.PNG
Jeff-Relf.Me/YouTubeSearch.PNG
Jeff-Relf.Me/YouTubeComHist.PNG
Jeff-Relf.Me/YouTubeComments.PNG