Update INSTALL.md

doc/INSTALL.md

@@ -4,14 +4,14 @@
 
 - Download and unzip `uMatrix.chromium-{version}.zip` ([latest release desirable](https://github.com/gorhill/uMatrix/releases)).
 - Rename the unzipped directory to `uMatrix` (if it is different)
-    - When you later update manually, replace the **content** of the `uMatrix.chromium` folder with the **content** of the latest zipped version.
+    - When you later update manually, replace the **content** of the `uMatrix` folder with the **content** of the latest zipped version.
     - This will ensure that all the extension settings will be preserved
     - As long as the extension loads **from same folder path from which it was originally installed**, all your settings will be preserved.
 - Go to chromium/chrome *Extensions*.
 - Click to check *Developer mode*.
 - Click *Load unpacked extension...*.
 - In the file selector dialog:
-    - Select the directory `uMatrix.chromium` which was created above.
+    - Select the directory `uMatrix` which was created above.
     - Click *Open*.
 
 The extension will now be available in your chromium/chromium-based browser.