The add-on manager's menu button doesn't work for me.
Try pressing it in the Firefox menu, no dice. Going into Options, and finding 'manage add-ons' in there works, but opens a new window. I usually drag the only tab of this new window into the existing window to work, but the issue stands.
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.com/kb/Safe+Mode