Why doesn't YouTube remember my Dark Theme and autoplay settings sometimes, when I refresh the tab or open a new one?
An issue has recently started on Mozilla Firefox (58.0.2, 64-bit) where, sometimes, refreshing the page or opening a new tab will cause the tab to revert to the normal (not Dark Theme) version. This is accompanied by the re-enabling of the Autoplay feature. I have to enable the theme and disable autoplay again, every time, and after a while (sometimes within the same hour) the next YouTube tab will have forgotten the settings again.
I have tried disabling all extensions and clearing YouTube cookies. Disabling extensions did nothing, while clearing cookies briefly seemed to fix the issue (or maybe it was just a coincidence), but the issue returned. What's going on?
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Many site issues can be caused by corrupt cookies or cache.
- Clear the Cache and
- Remove Cookies
Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.
Type about:preferences<enter> in the address bar.
- Cookies; Select Privacy. Under History, select
Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
- Cache; Select Advanced > Network.
[v57+] Select Privacy. Across from Cached Web Content, Press Clear Now.
If there is still a problem, Start Firefox in Safe Mode https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
A small dialog should appear. Click Start In Safe Mode (not Refresh). Did this help?
While you are in safe mode;
Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.
How to disable Hardware Acceleration {web link}
I noticed you have a YouTube add-on. Could this be causing problems?
FredMcD said
I noticed you have a YouTube add-on. Could this be causing problems?
Sorry for the long delay and thank you for the replies! It very well might be my "Magic Actions for YouTube" extension, however, if it is, I'll just have to live with it or find a similar alternative. YouTube itself lacks too many features I expect in my video players, most crucially the ability to scroll to adjust volume.
I will test your theories soon and give you feedback on them. Thanks again.