Build: Run tests on Firefox ESR as well

Closes gh-4530

(cherry picked from commit 0a73b94a21d4c30b5598b95923dc73d640e07b99)

diff --git a/.travis.yml b/.travis.yml
index 3b00dfb56454421c8a4800e01e216fb1f1e66525..214a809781888953cb4c74dcf19288c1acd2649d 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,5 +17,12 @@ matrix:
       addons:
         chrome: stable
         firefox: latest
+    # Run tests on Firefox ESR as well.
+    - node_js: "12"
+      env:
+        - NPM_SCRIPT="test:browser"
+        - BROWSERS="FirefoxHeadless"
+      addons:
+        firefox: latest-esr
 script:
   - npm run $NPM_SCRIPT