submit firefox addon to official addon site
Could you submit the Firefox addon to the offical Mozilla site here:
This will increase your visibilty in general and allows users to sync addons (and thus you addon) to multiple devices.
Firefox sync doesn't work with external addons unfortunately.
We unfortunately can’t do this :(. The Firefox addon store requires that your addon have a free to use version for all users. Since someone at your company has to pay for TeamPassword, we’re not allowed to be in their store.