Everytime I click on the down arrow on the firefox button firefox fills my monitor screen. How do I stop this as it did not happen in the past

Had to uninstall and reinstall firefox several times as something was trying to take it over. The only way I stopped it in the end was to go back to a restore point on my computer. Anyway, before I had this problem I had firefox leave a border down the right side of my screen. Now it is okay when I start firefox, border in place, but as soon as I click the down arrow on the firefox button for anything firefox covers the whole screen. How can I stop this?

You can check for problems with the localstore.rdf file.
*http://kb.mozillazine.org/Corrupt_localstore.rdf
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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