Turn them on one at a time until you can recreate the issue.

Then go to the about addons page and disable all the extensions. So close the Safe Mode and boot to the normal mode. Related: 9+ Best Mozilla Firefox Add-Ons

If you can access the websites in this mode, the issue was related to third-party extensions. The browser will now boot to the Safe Mode. Click Restart in the confirmation dialog box.Select on Help > Troubleshoot Mode option.

Click on the menu situated at the top right.

Doing so shall disable all the extensions, and you may then act accordingly. It would help if you started the browser in safe mode to verify whether that is indeed the case this time. Third-party add-ons, specifically those related to JavaScripts or changing in-page elements, have been notorious for breaking page components that result in their inability to load properly. However, this is only a one-time delay and would automatically be rectified once the site data gets re-populated. Related: How to Clear History, Cookies, and Cache in Firefox Computer?ĭeleting temporary data might sign you out of some websites and could also result in sites loading a few seconds late.

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