feat: add Firefox Android compatibility to manifest

- Move notifications and contextMenus to optional_permissions
- Set options_ui open_in_tab to true (required on Android)
- Add gecko_android with strict_min_version 113.0
- Bump version to 1.1.1

README.md

@@ -1,6 +1,6 @@
 # A YTPTube extension
 
-This extension can be used in `Chrome/Chromium browsers` and `Firefox` to add URLs
+This extension can be used in `Chrome/Chromium browsers`, `Firefox` and `Firefox for Android` to add URLs
 to [YTPTube](https://github.com/arabcoders/ytptube) instance.
 
 ## Screenshots
@@ -13,6 +13,28 @@ to [YTPTube](https://github.com/arabcoders/ytptube) instance.
 - Install
   from [Chrome/Chromium Browsers](https://chromewebstore.google.com/detail/ytptube-extension/kiepfnpeflemfokokgjiaelddchglfil)
 
+## Firefox for Android
+
+This extension is compatible with **Firefox for Android** (Fenix) version 113 and above.
+
+A few differences apply compared to the desktop version:
+
+- **System notifications** are not available on Android — feedback is displayed inline in the popup instead.
+- **The context menu** (long-press on a link → "Send to YTPTube") may not be available depending on your Firefox version.
+- **Options page** opens in a new tab rather than an inline panel.
+
+### Installing on Firefox for Android
+
+The easiest way is to install directly from the Firefox Add-ons store (link above).
+
+To install a development build manually, you will need **Firefox Nightly** or **Firefox Beta**:
+
+1. In Firefox Android, go to `about:config` and set `xpinstall.signatures.required` to `false`.
+2. Rename the `.zip` file to `.xpi`.
+3. Open the `.xpi` URL in Firefox Android to install it.
+
+Alternatively, use `about:debugging` on a desktop Firefox to sideload the extension onto a connected Android device via USB.
+
 ## Usage
 
 Configure the extension to point to your YTPTube instance in the extension options page.