docs: update install guide with AMO instructions

Author: mbahnizen

INSTALL_GUIDE.md

@@ -1,78 +1,50 @@
 # Installation Guide
 
-## Prerequisites
+## 🚀 Install from Firefox Add-ons (Recommended)
 
-- **Firefox** version 128.0 or later
-- An active **Outlook Web App (OWA)** or **Outlook 365** account accessible in your browser
+Users can install the extension directly from the official Mozilla Add-ons page:
 
-## Method 1: Temporary Installation (Development / Testing)
+[OWA Notifications on Firefox Add-ons](https://addons.mozilla.org/en-US/firefox/addon/owa-notifications-by-mbahnizen/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search)
 
-1. Open Firefox and navigate to `about:debugging`
-2. Click **This Firefox** in the sidebar
-3. Click **Load Temporary Add-on...**
-4. Navigate to the `src/` directory of this project
-5. Select the `manifest.json` file
-
-> **Note**: Temporary add-ons are removed when Firefox is closed. This method is ideal for testing.
-
-## Method 2: Permanent Installation (Signed .xpi)
+**Steps:**
+1. Open the link above in Firefox
+2. Click **"Add to Firefox"**
+3. Confirm installation
 
-Firefox requires add-ons to be signed by Mozilla for permanent installation.
+That's it — the extension is ready to use!
 
-### Step 1: Create a ZIP package
+---
 
-1. Navigate **inside** the `src/` directory
-2. Select **all files** (`manifest.json`, `background.js`, `content-script.js`, `options.html`, `options.js`, `options.css`, icons, etc.)
-3. Compress them into a ZIP file (e.g., `owa-notifications.zip`)
+## 🛠 Troubleshooting
 
-> **Important**: The `manifest.json` must be at the **root** of the ZIP file. Do not zip the `src/` folder itself from outside — zip its *contents*.
-
-### Step 2: Submit to Mozilla Add-on Developer Hub
-
-1. Go to the [Mozilla Add-on Developer Hub](https://addons.mozilla.org/en-US/developers/)
-2. Sign in with your Firefox Account (or create one)
-3. Click **Submit a New Add-on**
-4. Choose **On your own** (self-hosted distribution)
-5. Upload the ZIP file
-6. Wait for automated validation. If it passes, click **Sign Add-on**
-
-### Step 3: Download and Install
-
-1. After signing, Mozilla provides a download link for the `.xpi` file
-2. Download the `.xpi` file
-3. Drag and drop it into a Firefox window
-4. Click **Add** when prompted
-
-The extension is now permanently installed.
+| Issue | Solution |
+|-------|----------|
+| Extension doesn't activate | Make sure you have an OWA/Outlook tab open and are logged in |
+| No notifications appearing | Check Firefox notification permissions (Settings → Privacy & Security → Notifications) |
+| Folder scan returns empty | Navigate to the Mail view in OWA so the folder tree is visible |
 
-## Alternative: Firefox Developer Edition / Nightly
+---
 
-If you use **Firefox Developer Edition** or **Firefox Nightly**, you can bypass signing:
+## 🧪 Development / Testing (Optional)
 
-1. Navigate to `about:config`
-2. Search for `xpinstall.signatures.required`
-3. Set it to `false`
-4. You can now install unsigned `.xpi` or `.zip` files directly
+These steps are intended for developers contributing to the extension or testing local changes.
 
-> **Warning**: Disabling signature verification reduces security and is not recommended for general use.
+### Method 1: Temporary Installation (`about:debugging`)
 
-## Troubleshooting
+1. Open Firefox and navigate to `about:debugging`
+2. Click **This Firefox** in the sidebar
+3. Click **Load Temporary Add-on...**
+4. Navigate to the `src/` directory of this project
+5. Select the `manifest.json` file
 
-| Issue | Solution |
-|-------|----------|
-| Extension doesn't activate | Make sure you have an OWA/Outlook tab open and are logged in |
-| No notifications appearing | Check Firefox notification permissions (Settings → Privacy & Security → Notifications) |
-| Folder scan returns empty | Navigate to the Mail view in OWA so the folder tree is visible |
-| Extension removed after restart | You are using temporary mode — follow Method 2 for permanent installation |
+> **Note**: Temporary add-ons are removed when Firefox is closed.
 
-## Using with `web-ext` (Developer Workflow)
+### Method 2: Using `web-ext`
 
-If you have Node.js installed, you can use Mozilla's `web-ext` tool:
+If you have Node.js installed, you can use Mozilla's `web-ext` tool for live-reload development:
 
 ```bash
-npm install -g web-ext
-cd src/
-web-ext run
+npm install
+npm run start
+# (Runs: web-ext run --source-dir=src/)
 ```
-
-This launches Firefox with the extension loaded and provides live-reload during development.