Prevent unloading

[humble jewel]

New here so first of Hi to the world of users of the best browser!

Second to my question:
Is there a way to prevent unloading of tabs. Especially tabs that are playing sound/video.
I've tried using "zen.tab-unloader.excluded-urls" that didn't work. (Or maybe my way of typing the URL was wrong.)

[compact yew]

that pref does not exist

If tabs that are playing audio are automatically getting unloaded (and you did not alter any unload settings in the advanced prefs) that could mean your system is running very low on free memory.