Hi there! So sorry to hear about the trouble. The Mozilla Team is looking into a possible issue with Bookmark Sidebars after the last update. You can follow along or add your own comment here: https://bugzilla.mozilla.org/show_bug.cgi?id=1963549

I hope this helps!

Mine has gone missing as well you miserble cunts. WTF are you doing? Are you trying to destroy this product? Good fucking job then

Hi Belunos,

Please be mindful of your language. Most of the people who answer questions here are other users volunteering their time. Please see Mozilla Support rules and guidelines before posting here.

To update on the bookmark sidebar issue that Mandy brought up above, a fix will land with the release of Firefox 139 next week. Please be on the look out on May 27.