My Firefox starts a bit slow in the past time. I went to check the Addons and the Plugins, there are many deactivated but I can't uninstall them. I can uninstall the Addons that I deactivated but not the Addons that aren't active because of compatibility reasons (for example Kaspersky Virtual Keyboard). I also can't uninstall the Plugins.
Is there something I'm missing?
I run Firefox 39.0 on a Windows 7 laptop.