Forum communautaire Firefox

I need to know how to make subtitles readable again. I want bright white on dark back ground. This constant dim gray on light back ground is terrible. I am elderly, deaf in one ear and wear a hearing aid. I need the subtitles to be readable.

Please tell me how to fix them if it is something I can change. Or is it something the channel owner is doing? That same question applies to the YT bingo card video rectangles. Sometimes they are giant and in a single row I like the 3 wide display, like a bingo card.

Lastly, why do the video choices display on the right side of the screen? That makes the info below them unreadable. They used to be on the left side so hovering over the text is readable. Who is charge of fixing that?

I can run Firefox once after starting the computer. If I close Firefox, I cannot run it again. Any attempt to start says there is an instance of Firefox running so it cannot start. I did some research and for that running the following yielded some indication of a problem that I cannot seem to solve.

>taskkill /F /IM firefox.exe ERROR: The process "firefox.exe" with PID 10220 could not be terminated. Reason: There is no running instance of the task.

Something appears to have left this PID so that the computer thinks it is running when it appears that it isn't there.

Please advise. [edited email from community support forum]

I want to achieve windowed functionality of Firefox's F11 fullscreen mode, where there's no window borders nor tab/url bar, which pops in on hover. Having every pixel actually be web space is just preferable to me. This used to be possible in old Firefox versions simply by resizing a fullscreened FF window using a resizer extension or window manager (such as seen here, with version 55.0.3: https://drive.google.com/file/d/1klHdUHiKtLVITmrQnul8O1zF32l-Uz6c/view). At some point, something must have changed in FF's fullscreen API because it no longer responds to any of this.

I'm willing to pay anyone savvy enough to come up with a solution. Ideally by figuring out how to again be able to simply resize F11 windows. Note: "full-screen-api.ignore-widgets" isn't cutting it, there will still be a window border and the tab/url bar won't automatically pop up.

Cheers.

Immediately after my last Mozilla update, the system asked me if I wanted Firefox as my search engine. I clicked yes, as I always do when prompted. I don't know if this is the cause or if there's another connection I'm missing, but since then I haven't been able to access other websites. Every time I try, an error message appears saying "Oops, the system has crashed..." or something like that. However, if I use Google or Edge, everything works fine. How can I fix this problem? Can anyone help me? Thank you very much in advance.

my e-mail : [edited email from community support forum]