Disable XPI Install Delay
When talking about the SuperBrowser, It remind me the delay to install a new extension. Disable XPI Install Delay is the extensions that you should have to solve this problem, it simply disables default delay when installing extensions. I don't suggest you to overinstall extension on your firefox, but this extension will make installation more fast. Here is the editor's review :
This extension is aimed at power users who install a lot of extensions and know what they're doing. If this is not you, don't install it - it disables a crucial Firefox security feature. That said, I find it extrememly useful as I install and test many addons daily :)
Subscribe to Firefox Magazine's feed