add steps to add site shortcut for Firefox

README.md

@@ -10,9 +10,9 @@ Just pass your query as the path, and you will be redirected to the most relevan
 - [`a.stro.cc/islands`](https://a.stro.cc/islands) => `https://docs.astro.build/en/concepts/islands/`
 - [`a.stro.cc/github%20pages`](https://a.stro.cc/github%20pages) => `https://docs.astro.build/en/guides/deploy/github/`
 
-## Tip! 
+## Tip: Use this as a site shortcut!
 
-Use this as a site shortcut in Chrome!
+### Chrome
 
 - Navigate to [`chrome://settings/searchEngines`](chrome://settings/searchEngines)
 - Under **Site Search** select **Add**.
@@ -22,6 +22,23 @@ Use this as a site shortcut in Chrome!
 
 Now, you can type `astro` in Chrome's address bar, followed by whatever topic you'd like to jump to in the Astro Docs.
 
+### Firefox
+
+Firefox out of the box does not support adding a new search engine. However, there is an option to enable it. Here is how:
+
+- Open a new tab and navigate to `about:config`
+- In the search box, type `browser.urlbar.update2.engineAliasRefresh`.
+- At this point, the result list should be empty.
+  - If it is empty, click the **+** button at the top right.
+  - If the option already exists, set it to `true` by clicking the swap button on the right.
+- Now navigate to `about:preferences#search`.
+- Click on the **Add** button under the “Search Shortcuts” list.
+- In the popup, set the **engine URL** to `https://a.stro.cc/%s`.
+- Set the alias to `astro`, or anything you prefer!
+- Press **Add Engine**.
+
+Now you can type `astro` followed by your search term. It will redirect you into the Astro Docs! 
+
 🫡 Good luck out there, astronaut!
 
 ## Thanks