👷 Tolerate some failures in matrix testing

Tests on the profile created with Firefox 144 are expected to fail on older NSS versions (exact version to be determined)

Author: unode

.github/workflows/main.yml

@@ -5,6 +5,7 @@ jobs:
   test-firefox:
     runs-on: ${{ matrix.os }}-latest
     strategy:
+      fail-fast: true
       matrix:
         os: [ubuntu, macos, windows]
         # pypy3 not yet up to speed with py3.9 typing hints