Vimeo videos not playing on Firefox

So I clicked into a video, and it did not play. Further troubleshooting showed it was a video hosted by vimeo, and youtube videos still worked. I tried on multiple vimeo hosted videos, on multiple unconnected websites (dropout, patreon, and directly on the vimeo website). I tried the following fixes: * I opened it in a private window and nothing played. * I booted into safe mode, still nothing. * I turned off all of my add-ons, nope. * I cleared my cache and restarted, nothing. * I cleared my browsing data and restarted, also nothing. * I checked for updates: up to date. * I created a test profile, and it works there. * I opened Chrome and it worked there too. The test profile/chrome thing suggests it's an add-on or something but the fact that I turned them all off and this still happened has me baffled. Update: I fixed it. Was user error.