Mozilla Firefox deprecated silent installations after the release of Firefox version 74. Firefox only supports this feature in the Extended Support Release (ESR) versions.

Mozilla provides full documentation for Firefox Extensions Enterprise distribution with multiple distribution options.

One of these options is detailed below:

Deploy

1. Download the Firefox extension by right-clicking on this Download link and choosing "Save as...".

2. Rename the file to {e3be5efb-6c4f-431b-9919-98e09540fb05}.xpi
   Important: Do not skip this step. Mozilla will not allow running the extension if it has any other file name.

3. Copy {e3be5efb-6c4f-431b-9919-98e09540fb05}.xpi  to the Firefox extensions directory.
   Note: You might need to create some of the following directories:

4. Create the following directories if needed:
   - Windows: C:\Program Files\Mozilla Firefox\browser\extensions\{e3be5efb-6c4f-431b-9919-98e09540fb05}.xpi
   
   - macOS: /Library/Application Support/Mozilla/Extensions/{e3be5efb-6c4f-431b-9919-98e09540fb05}/{e3be5efb-6c4f-431b-9919-98e09540fb05}.xpi
   
   - Linux: /usr/lib/mozilla/extensions/{e3be5efb-6c4f-431b-9919-98e09540fb05}/{e3be5efb-6c4f-431b-9919-98e09540fb05}.xpi

5. Set up configuration files that cause Firefox to enable the extension by default. If you do not set up these configuration files, the extension will be disabled by default.

6. Create a text file called torii-mozilla.cfg  with the following contents:
   
   // Don't skip this comment. If the first line is not a comment, the file will not load.
   lockPref("extensions.autoDisableScopes", 0);

7. Save torii-mozilla.cfg  to the Firefox install directory:
   - Windows: C:\Program Files\Mozilla Firefox\torii-mozilla.cfg
   
   - macOS: /Applications/Firefox.app/Contents/Resources/torii-mozilla.cfg
   
   - Linux: /usr/lib/firefox/torii-mozilla.cfg

8. Create a text file called torii-prefs.js  with the following contents:
   
   // Don't skip this comment. If the first line is not a comment, the file will not load.
   pref("general.config.obscure_value", 0);
   pref("general.config.filename", "torii-mozilla.cfg");

9. Save torii-prefs.js to the /defaults/pref  subdirectory of the Firefox install directory:
   - Windows C:\Program Files\Mozilla Firefox\defaults\pref\torii-prefs.js
   
   - macOS: /Applications/Firefox.app/Contents/Resources/defaults/pref/torii-prefs.js
   
   - Linux: /usr/lib/firefox/defaults/pref/torii-prefs.js

10. Open Firefox and find the Torii Firefox extension installed.

You should use a dedicated tool to run these steps on your Windows/Mac/Linux devices.