Just updated to Firefox 57 and now Yahoo mail is constantly freezing while composing. Have to keep closing browser to unfreeze.

Go to the Firefox 3 Bar Menu --> Help ? --> Troubleshooting Information Page and take a look in the Accessibility section if accessibility is set to "true" there. if yes, go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check the setting to Prevent Accessibility Services from accessing your browser. Restart Firefox

Please let us know if this solved your issue or if need further assistance.

The Prevent Accessibility Services from accessing your browser box was already checked so that isn't the problem. Also, the Accessibility section has four boxes in blue, the first box in blue say's Activated, and that is marked False. The second box in blue say's Prevent accessibility, and that is marked 1. The third box in blue say's Accessible Handler Used, and that is marked True. The fourth box in blue say's Accessibility Instantiator, and that is blank. Also, why the heck would Mozilla release a new Yahoo Edition Browser and the Yahoo Tool Bar is not compatible with it. These people must be insane to release something that freezes up and is not compatible, and is incredibly confusing to troubleshoot for the average person.