Try to reset your Firefox browser. Issue should be fixed after reset.
Here is the step by step guide how to reset Mozilla Firefox
- Open Firefox and then go the Help menu (Press “F10” key once to active Menu bar)
- Go to Help menu then click on “Troubleshooting information”
Note: you can also open this page in this ways, open Firefox then type this command in the address bar “about:support” (without quote) and then hit enter or OK.
- You will get a page “Troubleshooting information” page, here you will get “Reset Firefox” option in the right side of the page.
- Click on Reset Firefox option and then follow their instructions to reset firefox.
- Mozilla Firefox should be Restored.