XUL is the biggest reason why Firefox feels so much slower on Windows and Linux compared to Chrome. So it's high time for Mozilla to remove it - along with support for Flash.
And you can use self hosted webmail instead of Thunderbird.
And you can use self hosted webmail instead of Thunderbird.
Can you explain why, or point to existing information on this subject?
And on Linux, Chrome's custom toolkit feels much faster than the Firefox XUL. Everything from opening new tab, switching tabs, menus, etc. And using Electrolysis doesn't help. So it's an issue with the XUL toolkit.