GWT 2+ is not working on Firefox 5, the plugin or pages compiled in GWT. Is there is a fix planned for this?
An application built entirely with GWT 2.1.1 will not render in Firefox 5. The same application renders in Firefox version 2,3 and 4. The GWT plugin will not function either.
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Try using compatability reporter
that works to solve problems with Google Addons relating to its toolbar, presumably it may help with your add-ons.
For problems with plugins (donate?) download, instal & run the extension from :
(donate ?) download, install & run.
No doubt Googl,s own forums will have information regarding compatibility with Firefox 5.
You mention Firefox 2, 3 & 4. Try 3.6 that is still supported. It is also available as a portable version from: http://portableapps.com/apps/internet/firefox_portable/localization#legacy36