Firefox and pages are broken
They had invisible icons which can be clicked on and show text like "dark reader etc." But when you click them it doesn't show anything I'm on windows 10
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You can try "Clear the startup cache..." via the "Help -> More Troubleshooting Information" (about:support) page.
You can check for problems with the extensions registry files in the profile folder.
Try to to reset the extensions registry and rename extensions.json (extensionsOLD.json) and rename/remove compatibility.ini in the Firefox profile folder with Firefox closed.
New files will be created when required.
See "corrupt extension files":
You can check for possible updates in case of issues.
- click the cogwheel (left of the Search bar) on the about:addons page to "Check for updates"
You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).
- Help -> More Troubleshooting Information -> Profile Folder/Directory:
Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder