Log message:
firefox91: update to 91.4.1

Change, singular:

    Fixed frequent MOZILLA_PKIX_ERROR_OCSP_RESPONSE_FOR_CERT_MISSING error
messages when trying to connect to various microsoft.com domains (bug 1745600)

Log message:
firefox91: Update to 91.4.0

Security Vulnerabilities fixed in Firefox ESR 91.4.0

    #CVE-2021-43536: URL leakage when navigating while executing asynchronous
    function

    #CVE-2021-43537: Heap buffer overflow when using structured clone

    #CVE-2021-43538: Missing fullscreen and pointer lock notification when
    requesting both

    #CVE-2021-43539: GC rooting failure when calling wasm instance methods

    #CVE-2021-43541: External protocol handler parameters were unescaped

    #CVE-2021-43542: XMLHttpRequest error codes could have leaked the existence
    of an external protocol handler

    #CVE-2021-43543: Bypass of CSP sandbox directive when embedding

    #CVE-2021-43545: Denial of Service when using the Location API in a loop

    #CVE-2021-43546: Cursor spoofing could overlay user interface when native
    cursor is zoomed

    #MOZ-2021-0009: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4

Log message:
firefox91-l10n: sync with firefox91

Log message:
www: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

Not committed (merge conflicts):
www/nghttp2/distinfo

Unfetchable distfiles (almost certainly fetched conditionally...):
./www/nginx-devel/distinfo array-var-nginx-module-0.05.tar.gz
./www/nginx-devel/distinfo echo-nginx-module-0.62.tar.gz
./www/nginx-devel/distinfo encrypted-session-nginx-module-0.08.tar.gz
./www/nginx-devel/distinfo form-input-nginx-module-0.12.tar.gz
./www/nginx-devel/distinfo headers-more-nginx-module-0.33.tar.gz
./www/nginx-devel/distinfo lua-nginx-module-0.10.19.tar.gz
./www/nginx-devel/distinfo naxsi-1.3.tar.gz
./www/nginx-devel/distinfo nginx-dav-ext-module-3.0.0.tar.gz
./www/nginx-devel/distinfo nginx-rtmp-module-1.2.2.tar.gz
./www/nginx-devel/distinfo nginx_http_push_module-1.2.10.tar.gz
./www/nginx-devel/distinfo ngx_cache_purge-2.5.1.tar.gz
./www/nginx-devel/distinfo ngx_devel_kit-0.3.1.tar.gz
./www/nginx-devel/distinfo ngx_http_geoip2_module-3.3.tar.gz
./www/nginx-devel/distinfo njs-0.5.0.tar.gz
./www/nginx-devel/distinfo set-misc-nginx-module-0.32.tar.gz
./www/nginx/distinfo array-var-nginx-module-0.05.tar.gz
./www/nginx/distinfo echo-nginx-module-0.62.tar.gz
./www/nginx/distinfo encrypted-session-nginx-module-0.08.tar.gz
./www/nginx/distinfo form-input-nginx-module-0.12.tar.gz
./www/nginx/distinfo headers-more-nginx-module-0.33.tar.gz
./www/nginx/distinfo lua-nginx-module-0.10.19.tar.gz
./www/nginx/distinfo naxsi-1.3.tar.gz
./www/nginx/distinfo nginx-dav-ext-module-3.0.0.tar.gz
./www/nginx/distinfo nginx-rtmp-module-1.2.2.tar.gz
./www/nginx/distinfo nginx_http_push_module-1.2.10.tar.gz
./www/nginx/distinfo ngx_cache_purge-2.5.1.tar.gz
./www/nginx/distinfo ngx_devel_kit-0.3.1.tar.gz
./www/nginx/distinfo ngx_http_geoip2_module-3.3.tar.gz
./www/nginx/distinfo njs-0.5.0.tar.gz
./www/nginx/distinfo set-misc-nginx-module-0.32.tar.gz

Log message:
firefox91: Update to 91.2.0

Security Vulnerabilities fixed in Firefox ESR 91.2

    #CVE-2021-38496: Use-after-free in MessageTask

    #CVE-2021-38497: Validation message could have been overlaid on another
    origin

    #CVE-2021-38498: Use-after-free of nsLanguageAtomService object

    #CVE-2021-32810: Data race in crossbeam-deque

    #CVE-2021-38500: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15,
    and Firefox ESR 91.2

Log message:
www: Remove SHA1 hashes for distfiles

Log message:
firefox91-l10n: sync with firefox91

Log message:
Add Firefox 91ESR as a starting point for the branch.