Run firefox tests on ubuntu-latest to see if they work

.github/workflows/test-changed-auth.yml

@@ -70,11 +70,8 @@ jobs:
         run: xvfb-run yarn test:changed auth
   test-firefox:
     name: Test Auth on Firefox If Changed
-    # Whatever version of Firefox comes with 22.04 is causing Firefox
-    # startup to hang when launched by karma. Need to look further into
-    # why.
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
       - name: install Firefox stable

.github/workflows/test-changed-firestore.yml

@@ -169,10 +169,7 @@ jobs:
 
   compat-test-firefox:
     name: Test Firestore Compatible on Firefox
-    # Whatever version of Firefox comes with 22.04 is causing Firefox
-    # startup to hang when launched by karma. Need to look further into
-    # why.
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: build
     if: ${{ needs.build.outputs.changed == 'true'}}
     steps:
@@ -202,10 +199,7 @@ jobs:
     strategy:
       matrix:
         test-name: ["test:browser", "test:travis", "test:lite:browser", "test:browser:prod:nameddb", "test:lite:browser:nameddb"]
-    # Whatever version of Firefox comes with 22.04 is causing Firefox
-    # startup to hang when launched by karma. Need to look further into
-    # why.
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: build
     if: ${{ needs.build.outputs.changed == 'true'}}
     steps:

.github/workflows/test-changed.yml

@@ -50,10 +50,7 @@ jobs:
 
   test-firefox:
     name: Test Packages With Changed Files in Firefox
-    # Whatever version of Firefox comes with 22.04 is causing Firefox
-    # startup to hang when launched by karma. Need to look further into
-    # why.
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
       - name: Checkout Repo