Video playback (and other misc. webapp) issues, which do not occur when using a Private Browser window

I am facing an issue with my Firefox. This most commonly occurs with video playback webapps like YouTube Shorts. Intermittently, but often enough to be incredibly annoying!!) videos will stick while audio plays in the background. This does not always happen, but once it starts there seems to be some sort of cooling off period before things work again. Reddit video player never works, seeming to silently crash - never showing the play button or video controls overlay. I have had miscellenious other issue with other website that include forms to fill out and navigate where the elements like "next" or "submit" are completely unresponsive. * Refreshing the page does not fix it. * Clearing Firefox's cache and data did not fix it. * "Refreshing" Firefox did not fix it. Strangely, the same video/page will always work on a Private browser window. I appreciate that these windows don't have extensions active, but I have activated every extension in private browsing and it still works. The only extensions I have are: * Privacy Badger * uBlock Origin * Bitwarden I have no idea what it is about my "normal" browser which is broken, and why things are fine in the private window, but this is immensely frustrating. I really don't want to have to change to another browser (Chrome... ew...) but I need this fixed if I am to continue.