Firefox is no longer compatible with a screen reader programs why?

Firefox 4.0 is no longer compatible with screen reader programs such as zoom text. I'm a visually impaired user and have never had problems until now. I want to revert back to 3.5 because now 4.0 is useless to me. If it isn't broken don't fix it. Mozilla just made things worse for me. Thanks a lot.

Your screen reader is no longer compatible because it's author has not updated it for FF4
Credit Tony E
To downgrade to Firefox 3.6 first uninstall Firefox 4, but do not select the option to "Remove my Firefox personal data". If you select that option it will delete your bookmarks, passwords and other user data. See https://support.mozilla.com/kb/Uninstalling+Firefox
You can then install the latest version of Firefox 3.6 available from http://www.mozilla.com/en-US/firefox/all-older.html - it will automatically use
your current bookmarks, passwords etc.
To avoid possible problems with downgrading, I recommend going to your profile folder and deleting the following files if they exist - extensions.cache, extensions.rdf, extensions.ini, extensions.sqlite and localstore.rdf. Deleting these files will force Firefox to rebuild the list of
installed extensions, checking their compatibility, and reset toolbar customizations.
For details of how to find your profile folder see https://support.mozilla.com/kb/Profiles

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