diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8252d777..b931b4e6 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,14 +5,15 @@ on:
       - master
   pull_request:
     branches:
-      - master
+      - master 
 jobs:
   test:
     name: Run Testing Suite
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        browser: [ChromeHeadless, FirefoxHeadless]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
       - name: Checking out Repository
         uses: actions/checkout@v1
@@ -20,15 +21,26 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: 12.x
+      - name: Update Brew (macOS)
+        if: matrix.os == 'macOS-latest'
+        run: brew update
+      - name: Install Chrome (macOS)
+        if: matrix.os == 'macOS-latest' && matrix.browser == 'ChromeHeadless'
+        run: brew cask install google-chrome
+      - name: Install Firefox (macOS)
+        if: matrix.os == 'macOS-latest' && matrix.browser == 'FirefoxHeadless'
+        run: brew cask install firefox
       - name: Install Dependencies
         run: yarn bootstrap
       - name: Run Tests
         run: yarn test
         env:
-          BROWSER: ChromeHeadless
+          BROWSER: ${{ matrix.browser }}
       - name: Upload Test Coverage to CodeCov
         # Container actions can only run on linux containers, which is sad.
         if: matrix.os == 'ubuntu-latest'
         uses: codecov/codecov-action@v1.0.2
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+      - name: Build Project
+        run: yarn build
\ No newline at end of file
diff --git a/package.json b/package.json
index f5970714..289048b2 100644
--- a/package.json
+++ b/package.json
@@ -101,6 +101,7 @@
     "karma": "^4.2.0",
     "karma-chrome-launcher": "^3.0.0",
     "karma-coverage": "^2.0.1",
+    "karma-firefox-launcher": "^1.2.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.5",
     "karma-sinon-chai": "^2.0.2",
diff --git a/yarn.lock b/yarn.lock
index b4fe2073..5682576c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5691,6 +5691,11 @@ is-wsl@^1.1.0:
   resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-1.1.0.tgz#1f16e4aa22b04d1336b66188a66af3c600c3a66d"
   integrity sha1-HxbkqiKwTRM2tmGIpmrzxgDDpm0=
 
+is-wsl@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-2.1.0.tgz#94369bbeb2249ef07b831b1b08590e686330ccbb"
+  integrity sha512-pFTjpv/x5HRj8kbZ/Msxi9VrvtOMRBqaDi3OIcbwPI3OuH+r3lLxVWukLITBaOGJIbA/w2+M1eVmVa4XNQlAmQ==
+
 isarray@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-0.0.1.tgz#8a18acfca9a8f4177e09abfc6038939b05d1eedf"
@@ -5997,6 +6002,13 @@ karma-coverage@^2.0.1:
     minimatch "^3.0.0"
     source-map "^0.5.1"
 
+karma-firefox-launcher@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/karma-firefox-launcher/-/karma-firefox-launcher-1.2.0.tgz#64fe03dd10300f9754d48f9ebfbf31f6c94a200c"
+  integrity sha512-j9Zp8M8+VLq1nI/5xZGfzeaEPtGQ/vk3G+Y8vpmFWLvKLNZ2TDjD6cu2dUu7lDbu1HXNgatsAX4jgCZTkR9qhQ==
+  dependencies:
+    is-wsl "^2.1.0"
+
 karma-mocha-reporter@^2.2.5:
   version "2.2.5"
   resolved "https://registry.yarnpkg.com/karma-mocha-reporter/-/karma-mocha-reporter-2.2.5.tgz#15120095e8ed819186e47a0b012f3cd741895560"