From 90e408a53ba3dc78cb3558c343170d338d8f1658 Mon Sep 17 00:00:00 2001
From: Jens Fredskov <jsfr@users.noreply.github.com>
Date: Mon, 20 Oct 2025 15:33:49 +0200
Subject: [PATCH 1/2] Add Firefox support with manual installation instructions

Updated manifest.json to support both Chrome and Firefox browsers by removing Chrome-specific schema and adding Firefox gecko settings. Added Firefox installation section to README with instructions for manual installation as a temporary add-on.
---
 README.md     | 17 +++++++++++++++--
 manifest.json |  9 +++++++--
 2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 1ece64e..b593f81 100644
--- a/README.md
+++ b/README.md
@@ -25,17 +25,30 @@ A browser extension that brings syntax highlighting to file diffs in Azure DevOp
 
 ## Installation
 
-### From the Chrome Web Store (Recommended)
+### Chrome
+
+#### From the Chrome Web Store (Recommended)
 
 [Available in the Chrome Web Store](https://chromewebstore.google.com/detail/syntax-highlighter-for-az/lclohacjbfchomeeopaffkedfnbjicdn)
 
-### Manual Installation
+#### Manual Installation
 
 1.  Download or clone this repository.
 2.  Open Google Chrome and navigate to `chrome://extensions`.
 3.  Enable "Developer mode" in the top right corner.
 4.  Click "Load unpacked" and select the directory where you downloaded the repository.
 
+### Firefox
+
+#### Manual Installation
+
+1.  Download or clone this repository.
+2.  Open Firefox and navigate to `about:debugging#/runtime/this-firefox`.
+3.  Click "Load Temporary Add-on".
+4.  Navigate to the extension directory and select the `manifest.json` file.
+
+**Note:** The same `manifest.json` works for both Chrome and Firefox. For permanent installation in Firefox, the extension needs to be signed by Mozilla or installed as a temporary add-on (which resets on browser restart).
+
 ## Usage
 
 Once installed, the extension will automatically apply syntax highlighting to files in any Azure DevOps pull request you view. There are no additional steps required.
diff --git a/manifest.json b/manifest.json
index 6537189..9a71eef 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,5 +1,4 @@
 {
-  "$schema": "https://json.schemastore.org/chrome-manifest",
   "manifest_version": 3,
   "name": "Syntax Highlighter for Azure DevOps",
   "version": "0.5.0",
@@ -24,5 +23,11 @@
       "css": ["prism/prism.css", "custom_styles.css"],
       "run_at": "document_idle"
     }
-  ]
+  ],
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "ado-syntax-highlighter@ckob.github.io",
+      "strict_min_version": "109.0"
+    }
+  }
 }

From 23729cb7efadb8fe5249d48dce753aa4c81aa87f Mon Sep 17 00:00:00 2001
From: Jens Fredskov <jsfr@users.noreply.github.com>
Date: Tue, 21 Oct 2025 11:31:28 +0200
Subject: [PATCH 2/2] Add Firefox Manifest V3 background script compatibility

---
 background.js | 6 +++++-
 manifest.json | 3 ++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/background.js b/background.js
index 66f6414..ab46faa 100644
--- a/background.js
+++ b/background.js
@@ -1,4 +1,8 @@
-importScripts('browser-polyfill.min.js');
+// Load browser polyfill for Chrome service worker
+// Firefox will load this via the scripts array in manifest.json
+if (typeof importScripts !== 'undefined') {
+  importScripts('browser-polyfill.min.js');
+}
 
 function injectContent(tabId) {
   console.log(`ADO Syntax Highlighter: Injecting into custom host on tab ${tabId}`);
diff --git a/manifest.json b/manifest.json
index 60b4f9c..3527817 100644
--- a/manifest.json
+++ b/manifest.json
@@ -21,7 +21,8 @@
     "*://*/*"
   ],
   "background": {
-    "service_worker": "background.js"
+    "service_worker": "background.js",
+    "scripts": ["browser-polyfill.min.js", "background.js"]
   },
   "options_ui": {
     "page": "options.html",