4f5cb46ceb
See https://www.mozilla.org/en-US/firefox/83.0/releasenotes/ Fixes https://www.mozilla.org/security/advisories/mfsa2020-50/ * remove all the MOZILLA_USE_* and the common BUILD_DEPENDS bits that were removed from mozilla.port.mk * properly install share/pixmaps/firefox.png and point at it in the desktop file, should ease icon overriding by third-party themes * drop patch fixing build on arm64 from #1672619 merged upstream * drop patches from #1666701, merged upstream