The mb limit for backgrounds makes this a no go for me.

If the firefox home page can do an animated gif/apng with 0 limits, why can't this?

Literally won't let you use a custom background that's over 2MB in size.

I like the features, except one big problem, the "Renewed Tab" refreshes every some time, nullifying all the thing you type in the address bar, to me that is the biggest problem and it is very annoying. I hope this will be fixed sometime in future, until then im gonna disable this extension.