All firefox based browsers stop video playback if window/tab loses focus

Hello, for some reason firefox and all firefox related browsers have developed a problem on my system. All videos and streams stop playing if the window/tab loses focus.… (read more)

Hello, for some reason firefox and all firefox related browsers have developed a problem on my system. All videos and streams stop playing if the window/tab loses focus. This is not the first time this has happened but earlier this year using the about:config flag I will mention below the problem seemed to be fixed but now it is back and worse than ever. I have a symmetrical gigabit connection and the problem only occurs in firefox and it's related browsers, no other aspect of my internet is affected, just video/streams and only in these kinds of browsers.

I do have a bunch of extensions but all are ones I have had for a long time, years in most cases, they were not the cause of the problem before and starting in troubleshoot mode plus a fresh profile in a fresh instal confirmed they are not to blame now either.

To be precise about the issue, when I say the videos stop that is exactly what I mean, there are no lags, no buffering, no partially loaded video bar( where applicable), no tab crashes, no connection problems, no warnings about certain tabs or extensions slowing things down, nothing at all, the video simply stops.

I have tried

- safe/troubleshooting mode to rule out any extensions
- with and without my vpn running
- doing fresh installs of the browsers/ complete fresh slate, revo uninstaller pro ran and using fresh profiles 
- found some suggestions for the about:config page, namely window_occlusion_tracking
- found some contradicting information about hardware acceleration but I tried both with and without and it makes no difference
- experimenting with different versions of firefox, so if you can see which version I am using as I post this, the reason it is not the latest version is because I have tried rolling back through older releases to find one that works, but have yet to suceed,

But no matter what I have tried I cannot get the problem sorted. Either I have that specific window and tab as the sole active window on my device or I need to click into it and either reload the tab or push the play button multiple times before playback resumes.

Open to ideas because i'd rather not have to resort to chrome, thanks

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"https://download.sp.f-secure.com/online-safety/fs_firefox_https.xpi"

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I do not know where the problem is. It could be with Spectrum software. I did call them first. The lady on the phone says it is a Firefox problem and to seek help from Mozilla.

When I click on the box for setting up secure browsing (I have tried both boxes (top right and 2nd to bottom left) on the screen in the image attached), I just get a new window open with "https://download.sp.f-secure.com/online-safety/fs_firefox_https.xpi" in the navigation box and the rest is white space. There is no spinning wheel, no bell, nothing.

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https://sb360.online/cu0v2n

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