Thunderbird wont start except in safe mode and then too takes about 10 minutes or more. There was a similar question asked I see in 2015 and the solution was to disable lightning. However, since I cannot start Thunderbird except in "safe" mode I cannot access Lightning via the "tools-add-ons-extensions" route as it shows no "lighting add-on" I have had to keep Thunderbird open all the time as a result so I can have quick access to my e-mails. Any fix would be greatly appreciated.