usi (User|Unified Script Injector)

By: USI

use UserScripts on your Firefox for Android with usi!

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Install

Features & Capabilities

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)

User Growth & Download Statistics

Add-on

By:

USI

Daily users:

51 -3

Rating:

3.88

(25)

Version:

0.5.16 Last updated: 2020-11-25

Version code:

5138284

Creation date:

2015-03-25

Risk:

Permissions:

Content scripts matches:

Size:

1018.71KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-20

Compare stats and ranking:

Ranking

# 15,409 ▼ 437

Other rankings

#29 in inject keyword 14 #41 in jquery keyword 18 ▼ 2#41 in usb keyword 12 ▼ 1#52 in script keyword 28 ▼ 1#247 in android keyword 26 ▼ 4

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

USI

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/userunified-script-injector/

Website:

https://github.com/usi-firefox/usi/

User Reviews

Can't install scripts from Greasy Fork and when I install them manually they don't work

by Ge*****, 2022-10-01

View all user reviews ›

Is usi (User|Unified Script Injector) Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

usi (User|Unified Script Injector) requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

usi (User|Unified Script Injector) has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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