I-Firefox Isithangami Sokwesekwa

I have enabled my new Theme but it keeps defaulting back to my old Theme. I have tried closing Firefox and opening new tabs. Opening a new tab also changes it back to the default theme. I have sent an image of the old theme. The new theme is Aurora Australis. And the second image shows this Theme enabled. What gives? Carl

When I click on "Bookmark current tab," the small bookmark window opens as usual. But if I then click on "save," nothing happens. The bookmark does not get saved anywhere and the window does not close. Likewise, if I click on "cancel," nothing happens and the window also stays open. Only if I click somewhere outside of the bookmark window does the bookmark get saved and the window close. This has happened only in the current and previous version of Firefox. How can I fix this?

YouTube content doesn't load. Same with NYTimes.com articles.

Up to date, no extensions, no add-ons.

Running Sonoma 14.4.1

Safari and Chrome work as expected.