[ZoFreX]

I don't think it really counts as an "upgrade" if you opt-in to a beta.

[lurker19]

True, but unless FF adds a "re-version-tag my addons based on feedback from testers" feature, we will get bitten when FF5 final comes out and disables all existing deployed extensions.

[gmac]

In actual fact, they've changed the process so this generally won't happen:

http://blog.mozilla.com/addons/2011/04/19/add-on-compatibili...