Stop running tests on browsers that time out after finishing all tests.

Firefox is already being tested at stable by the non-Sauce workflow.

Author: bicknellr

.github/workflows/tests.yml

@@ -86,13 +86,15 @@ jobs:
         env:
           SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}
           SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
+        # This list of browsers originally included 'os x 10.12/safari@10' and
+        # 'Linux/firefox', but these browsers both time out after running all
+        # tests. This doesn't happen locally, so I'm not sure what's different
+        # in GitHub actions that would break this.
         run: >
           npx wct --npm
           -s 'windows 10/microsoftedge@15'
           -s 'windows 10/microsoftedge@17'
           -s 'windows 8.1/internet explorer@11'
           -s 'os x 10.11/safari@9'
-          -s 'os x 10.12/safari@10'
           -s 'macos 10.13/safari@11'
           -s 'Linux/chrome@41'
-          -s 'Linux/firefox'