We need to set the Firefox window dimensions in pixels for OBS with "Customize UI" More Tools menu

[KabukiStarship]

I do C++/TypeScript/Python live coding with OBS and I'm sick and tired of having to set the Firefox window size manually to fit in my OBS scenes; it's a major pain in the rear. There has been some browser extensions that do this, but some Extensions have been removed. We should be able to set the browser window size in pixels using the More Tools menu, possibly saying "Customize UI". I have a startup, I can make a Windows utility like Sizer, but why do I have to do this? I don't want to have to program or download that third-party. In OBS, I REQUIRE the Firefox window to be the EXACT SAME SIZE in EVERY FRAME, else it will ruin my live stream. This is Firefox's responsibility as the best web browser to work right with OBS. I will live code it myself if we get a green light.

[Jon]

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