Sync will bring back your extensions from the other devices once you sign into your Mozilla account. Refresh is scary which is why I've only done it maybe 3 times in all my years running Firefox.  ;-) I also run most versions of the browser plus Waterfox on several devices so my data is in more than 1 browser and on more than 1 device. see old screenshot

Whatever your issue is, it could be diagnosed by running Troubleshoot mode to see if an extension or too many of them is the issue.

https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#w_how-to-start-firefox-in-4troubleshoot-modesf5safe-modesf