Do you still see all extensions in "Firefox/Tools > Add-ons > Extensions"? Did you refresh (reset) Firefox during your update and created a new profile? This could happen if Firefox reported that it was starting slowly. When you reset/refresh Firefox then a new profile is created and some personal data (bookmarks, history, cookies, passwords, form data) is automatically imported. The current profile folder will be moved to an <u>"Old Firefox Data"</u> folder on the desktop. Installed extensions and other customizations (toolbars, prefs) that you have made are lost and need to be redone. It is possible to recover data from the old profile, but be cautious not to copy corrupted files to avoid carrying over problems. *https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Hi, I see you are using Classic Theme Restorer, so try temporarily disabling that, then click on Restore Defaults as shown in [[Customize Firefox controls, buttons and toolbars]].