Forcing scroll bars in Firefox

[rutabaga]

Hopefully someone can help....

I have been using Proxomitron for quite a lot of years, but I cannot code HTML or Javascropt or anything like that, so I need some help.

I have very poor eyesight and as such I have to zoom in about 600% when browsing (and Firefox allows this sort of zoom level) but lately I have been having problems because many sites (particularly Google products) have disabled scroll bars in what I guess is an attempt to force their idea of user interface on people.

This means that if (for example) I go to Youtube where at 100% scroll level the fixed top margin takes up something like 10% of the screen (which is still annoying); for me the unscrollable, fixed top margin takes up more than 50% of the screen when I view it at 600% zoom. This is not to mention the screen space taken up by the broser itself, so I am basically viewing Youtube in a letterbox.

Gmail is worse, because it has fixed top AND side bars, but there is at least a Firefox addon that at least at the moment fools it into giving me scroll bars.

The Firefox help forums have not helped me.

So.... in desperation my question is this; is there any way, using Proxomitron, I can force the use of scroll bars by Firefox to scroll away the fixed margins of the type used on Gmail or Youtube? I just want to somehow add scroll bars where they have been disabled and I am hoping that if they have been turned off, then there is some global way via Proxo to turn them on.

Any help would be appreciated.

I have added a couple of screenshots to demonstrate my problem.

p.s. I use XP