please consider this issue in the Mozilla tracker: https://bugzilla.mozilla.org/show_bug.cgi?id=476430
- it seems like your issue is an actual feature they've implemented explicitly. The thread discussion there is quite long though, but the commits and patch sets (e.g. http://hg.mozilla.org/mozilla-central/rev/eee41544cb84
) pretty much sum it up: "Disable third-party add-ons by default and offer them to the user."
Still, according to Mike Kaply's blog, one can easily disable this new feature by setting the extensions.autoDisableScopes
option to 0
; see http://mike.kaply.com/2012/02/09/integr ... o-firefox/
. Note, however, that he mentions this approach being suboptimal in a later post, also suggesting an alternative: http://mike.kaply.com/2012/02/21/unders ... on-scopes/
Regarding your second question, re-setting the installation for a particular user, I'd assume that removing any adblockplus.*
option via about:config
should have the desired effect.
Please note that I haven't tried anything of the above it myself yet, due to the lack of a Windows machine right now. So please let us know about the results when you've got a chance to try it out!