Mac FF 34.05 update caused FF to hang when starting and could not workaround.
Reinstall did not fix. As different user, FF worked. How to get FF to work again? Upon trying to start FF 34.05, only the menu item "Firefox" was displayed (i.e., no File, Edit, View, ...). Although I could click on the Firefox menu "Quit" nothing happened, so I had to Force Quit the Firefox app. Restarted Mac after this and still did not work. Tried "safe start up" by holding Option key, but that did not do anything.
I did a reinstall, but that did not help. I removed the ~/Library/Application Support/Firefox folder, but that did not help. [Did not restart after doing this and will try that next although I don't expect this to help]
Alla svar (1)
Your user profile may have been contaminated. You said it worked using a different user profile?
Create a new profile. See if there is any problem.
https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles On 32-bit Windows: "C:\Program Files\Mozilla Firefox\firefox.exe" -p On 64-bit Windows: "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -p
https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles