Add Firefox for testing (#62)

* Add Firefox for testing
* Remove xfail marker from `test_draw_math_text` because it passes now.

Author: agriyakhetarpal

.github/workflows/main.yml

@@ -9,7 +9,7 @@ permissions:
   contents: read
 
 concurrency:
-  group: main-${{ github.head_ref || github.run_id }}
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
 jobs:
@@ -22,10 +22,12 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         pyodide-version: [0.26.4]
-        test-config: [
-          # FIXME: timeouts on recent versions of Chrome, same as micropip
-          {runner: selenium, runtime: chrome, runtime-version: 125},
-        ]
+        test-config:
+          [
+            # FIXME: timeouts on recent versions of Chrome, same as micropip
+            { runner: selenium, runtime: chrome, runtime-version: 125 },
+            { runner: selenium, runtime: firefox, runtime-version: latest },
+          ]
 
     steps:
       - uses: actions/checkout@v4

tests/test_html5_canvas_backend.py

@@ -1,7 +1,6 @@
 import base64
 import pathlib
 
-import pytest
 from conftest import matplotlib_test_decorator
 from pytest_pyodide import run_in_pyodide
 
@@ -277,9 +276,6 @@ def run(selenium, handle, ref):
 
 
 @matplotlib_test_decorator
-@pytest.mark.xfail(
-    reason="TODO: pytest_pyodide.pyodide.JsException: InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable"
-)
 def test_draw_math_text(selenium_standalone_matplotlib):
     selenium = selenium_standalone_matplotlib