Now you can use your Userscripts on your Firefox for Android, too.

Firefox 57+
Please install USI in version 0.5.1.x for usage in Firefox 57 and above.

If you find any Bugs, please create an issue at https://bitbucket.org/usi-dev/usi/issues/

• experimental Greasemonkey functions (GM_getValue,GM_setValue,GM_deleteValue,GM_listValues,GM_setClipboard,GM_openInTab,GM_log,GM_addStyle)
• you can add a Userscript through a simple Textbox on your device, or you load it by an URL
• if you open a Userscript in it's own tab with an ".user.js" ending, USI will ask if you want to import this Userscript
• you can use jQuery in your Userscripts (@include-jquery)

Note:
This Addon is still an alpha version, many things will not work properly.

Userscripts written for Greasemonkey won't run sometimes, because of the handling for @run-at defined in the meta block.
Try to change it from "document-start" to "document-ready" if some Userscripts does not run. For more Information about this topic, take a look on this page where contentScriptWhen is explained (https://developer.mozilla.org/en-US/Add-ons/SDK/High-Level_APIs/page-mod)

Install

• License: GNU Lesser General Public License v2.1 or later
• Weekly downloads: 3
• Average daily users: 100
• Rating: 3.88/5 of 25 ratings
• Created: 2015-03-25 13:41:56
• Last updated: 2020-11-25 08:18:14
• Homepage: https://bitbucket.org/usi-dev/usi/
• Support site and email
• Orig: https://addons.mozilla.org/en-US/firefox/addon/userunified-script-injector/
• API: firefox-addon-usi@jetpack