I believe I found a fix for it. Just did a search using Firefox Help and found this... ------ In the Location bar, type about:config and press Enter. The about:config "This might void your warranty!" warning page may appear. Click I'll be careful, I promise!, to continue to the about:config page. In the Filter field, type mousewheel.withnokey. Check these settings: If mousewheel.withnokey.action does not have a value of 0, double-click on it and change it to 0. If mousewheel.withnokey.numlines does not have a value of 1, double-click on it and change it to 1. ---- The second item for me was set to 6 for some reason...switch it to 1 and have not had a problem with scrolling all day!