Sorry for the delay in response. When you as Firefox to restart with add-ons disabled, you get two choices:

• Start in Safe Mode
• Refresh Firefox

If you use Start in Safe Mode, extensions are disabled and a number of advanced features are deactivated. To get back to normal, exit completely out of Firefox and start it up in the usual way.

If you Refresh Firefox, your old settings folder is moved to the desktop inside an Old Firefox Data folder. Your bookmarks are carried over, but no add-ons.

Does that help provide context? Did you use Refresh?

You can open the Web Console (Firefox/Tools > Web Developer).

• https://developer.mozilla.org/Tools/Network_Monitor

Check on the Network tab if content from specific domains fails to load (file size is 0 ). You can reload web page(s) and bypass the cache to generate a fresh log.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Hold down the Shift key and left-click the Reload button
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

Clear the cache and remove cookies only from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"