@firefox I can't drag tabs out of the window, to
detach them. Dragging them back in works (after selecting "Move to new Window")

@firefox Especially on mobile connections FF on
Android is way slower compared to Chrome.

@firefox Where is the spellcheck?!

@firefox The screenshot feature is really
awesome!

@firefox I cannot double-click and select parts
of the URL in the search bar, which are separated by slashes. That's a feature I
use quite often.

@firefox Running two profiles at the same time is
a bit cumbersome, since there is no UI for that.

@firefox FF has no window control icons in the
tab bar as Chrome has.

I can use Alt+F3 to bring up the KDE window manager context menu or drag the
window with the mouse to the upper border to maximize it, though.

@firefox On Windows I have that!

@firefox On Linux the No Border window option
removes the OS window bar, which gives you more screen real estate.

Chrome has this via its own right click menu "Use system titlebar and menu".

@firefox TweetDeck works!

@firefox FF has a profile manager (lile Chrome),
but you need to start it from the command line in order to manage multiple
profiles:

firefox -P

I use one work personal browsing and one for work.