I've seen two other reports of this, but don't know what causes it.

• why does arrow show up on startup as if i downloaded something

• arrow moving after load webpage

You can disable this notification by toggling the browser.download.animateNotifications to false on the about:config page.

You can open the about:config page via the location bar.

• http://kb.mozillazine.org/about:config

Start Firefox in Safe Mode 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.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Well, i stumbled across that little arrow at top right of Firefox just to the left of the little house, opened it and found 2 of my downloads were still there and running. So, i immediately took the option to cancel them and now all is well, the arrow problem fixed.

Oh, maybe they were resumed from a previous session? If it happens every time you restart Firefox, perhaps you have a page open that pushes a download (a lot of sites do that, show a success page while the server is preparing the push a download).

You can also check for problems with the sessionstore.js and sessionstore.bak files in the Firefox profile folder that store session data.

Rename (or delete) the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox profile folder.

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Multiple_profile_files_created

Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost and you will have to recreate them (make a note or bookmark them if possible).