Safe Mode is a diagnostic tool used for troubleshooting issues in Firefox. It temporarily disables extensions, themes, hardware acceleration and some other settings. It isn't intended to be used for normal browsing.

I was told, in order to deal with an issue, to try using it in Safe mode but I have no idea how to do that.

Safe Mode temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes) that might be causing problems.

With Firefox open: Select Menu Select Help Select Restart With Add-ons Disabled On the dialog select Restart On the next dialog select Start In Safe Mode (Do Not select Refresh)

With Firefox closed: Press and hold the Shift (in Mac: Option) key Launch Firefox On the dialog select Start In Safe Mode (Do Not select Refresh)

(Your Bookmarks Toolbar will be turned off. Right-click on the Toolbar and select Bookmarks Toolbar to display it again.) ______________________________________________________

To quit Safe Mode: Select Menu Select Help Select Restart With Add-ons Enabled

Or Exit Firefox.

What issue do you have you would want to check in Firefox Safe Mode ?