Various mobile friendlieness issues in FF upstream reported by el

el wrote in #mobile-config-firefox:

title bar touch moving doesnt work: https://bugzilla.mozilla.org/show_bug.cgi?id=1794243
overflow menu sometimes malfunctions on small screens and cuts off entries without ability to scroll: https://bugzilla.mozilla.org/show_bug.cgi?id=1810130
password manager prompt may collide with on-screen keyboard: https://bugzilla.mozilla.org/show_bug.cgi?id=1911043
many of the context menus pick a weirdly tiny or off-center size that on small screens makes them hard to navigate: https://bugzilla.mozilla.org/show_bug.cgi?id=1918913
the toolbar customization isnt really reachable via touch only, and if you get there almost none of the items can actually be dragged around: https://bugzilla.mozilla.org/show_bug.cgi?id=1793038
touch scrolling in all context menus including the hamburger menu seems to be broken: https://bugzilla.mozilla.org/show_bug.cgi?id=1931768

it would be great to go through these and see if they could be fixed upstream etc.

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