The question about developers charging money for the use of add-ons seems to be getting brought up again lately. One of the more active theme developers has started to charge for premium versions of their themes, leaving free basic versions still available on addons.mozilla.org. There are a couple of different issues with this, both of which many users are taking exception to. Apparently once I started writing about this I couldn’t stop so I’ve split this out into a couple of different posts to follow.