Neowin found a photo of a new add-on manager concept that Mozilla is working on for Firefox 5.
The concepts, titled ''Potential Selection Screen Interface'', feature two shots of a redesigned add-on manager, with one titled ''Automatic Add-on Update Are [sic] Enabled''. The other is titled ''The User Has Disabled Automatic Add-on Updates'', clearly suggesting that Firefox 5 users will be able to enable such a feature. At the moment, Firefox will prompt the user when an add-on update is available, but will not install an update without user interaction.
A text addendum to the screen shots suggests any add-ons installed without user permission will be disabled until the user chooses to have them enabled. It is possible Mozilla will introduce such a feature to proactively prevent add-ons disturbing the user's browsing experience, as happened last month prior to Mozilla's blocking of the Skype add-on for Firefox.