Go to Tools > Add-ons and disable all extensions. Close Firefox and reopen it. Is it still ok? If so, you will need to enable each extension, one at a time and close and reopen Firefox after enabling the extension to find out which one is causing the problem.
If disabling Add-ons makes no difference, click on Themes and uninstall your current Theme. If still no joy, click on Plugins and follow the same procedure for Add-ons.
Let me know how you get on.
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