I have been running Firefox for almost a month now. The divide between firefox and Chrome is getting bigger and bigger.

1. What do you guys think about sidebars and multiple toolbars? There is only a limited space available on screens these days for most people. I find them very archaic.

2. Dropdown arrows - I also don't understand the purpose of actually showing that if you click here a menu will open. A folder expands when you click it. There is nothing to be said about it.

3. Lack of overlay icons. There is literally a block with yellow background which shows number.

4. Lack of interest in devs to innovate on Firefox. There is a difference in versions of Evernote webclipper for Firefox and Chrome. Diigo extension is in atrocious condition.

Why do you think a solid browser like Firefox is lagging behind in UI compared to Chrome?