Bug 857901: Increase keyboard character-delete speed

UX informs me that 75ms seems to be a good interval, and that the
initial delay is fine where it is.
Bug 876145: fix authentication dialog in browser (wrong attribute)

Replace l10n-id with data-l10n-id in browser. As it is, the
authentication dialog's title is always displayed in English.
Bug 877960: followup to check the pref by default.
Merge remote-tracking branch 'upstream/master'
merge
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Bug 876703 - [Browser] Make activity filter case insensitive on URL protocol (http://).
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Bug 856074 - Controls on the call screen should be disabled until the call is reported connecting when dialing emergency number in airplane mode
Bug 879177 - Can't fully scroll when searching (first time) contacts
Bug 877990 - Adding minimum delay between automatic requests to respect performance limits.
Merge pull request #10186 from lodr/bug-877990-performance-limits

Bug 877990 - Adding minimum delay between automatic requests to respect performance limits.
r=@jmcanterafonseca
Bug 877615 - [MMS] New message composer: Recipients field stays expanded after discarding a previous multi recipient message - r=gnarf37

- #messages-recipients-list is declared "singleline" in markup
- Test to enforce recipient list always begins in singleline mode

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Closes gh-10193
Bug 875690 - [MMS] [UX] Thread view. Wrong alignment of elements - r=gnarf

Closes gh-10091
Merge remote-tracking branch 'upstream/master'
Bug 879273 - linter fixes, r=Rik
Merge pull request #10188 from fabi1cazenave/linter-bug879273

Bug 879273 - linter fixes, r=Rik