Have you checked the theme you are using?

Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

It is possible you selected one of the Colorways themes that are included in Firefox. You can find the built-in themes (light, dark, system) and further down the Colorways themes included in Firefox on the "Add-ons and Themes" page (Ctrl+Shift+A; Themes tab).

• https://support.mozilla.org/en-US/kb/personalize-firefox-colorways
• https://support.mozilla.org/en-US/kb/use-themes-change-look-of-firefox
• https://blog.mozilla.org/en/products/firefox/introducing-new-colorways-for-firefox-94/

Neither of these solutions have helped and I am unable to upload a screenshot. It just spins. It isn't an add-on because I am running in safe mode.

Use these links to create a new profile. Use this new profile as is. Is the problem still there?

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Type about:profiles<enter> in the address box.

Haven't had any success yet.

You can use imgur to upload screenshoot, and paste the link here. By the way, what version of Firefox do you use?

Here is a link to the screenshot: https://imgur.com/eL42BE3

Have you checked the theme you are using?

Type about:addons<enter> in the address box to open the Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)

On the left side of the page, select Appearance or Themes. Then select Default or System theme — auto. Now restart Firefox.