Greasemonkey
Customize the way a web page displays or behaves, by using small bits of JavaScript.
Greasemonkey: Customize Web Page Display | Firefox Add-On
Greasemonkey is an advanced Firefox add-on that provides users the opportunity to personalize how a webpage displays or functions. Through scripting small JavaScript snippets, users can modify internet pages, create personalized site scripts, or use existing ones. It also provides a platform for troubleshooting and script hosting.
Add-on stats
Manifest V2
Rating: 4.18 
(1,262)
Weekly download count: 4,600
Firefox on Android: Yes
Permissions:
- <all_urls>
- clipboardWrite
- cookies
- downloads
- notifications
- storage
- tabs
- unlimitedStorage
- webNavigation
- webRequest See more
Size: 630.49K
URLs: Website
Full description: See detailed description
Ranking
# 101 ▼ 1
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
User reviews
These summaries are automatically generated weekly using AI based on recent user reviews.
Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate,
spammy, or outdated. Pros
- Perfect
- Nice extensions
- trop bien
Cons
- It's not working
- nothing works
- no support
- no online tutorials match up with the screen
Most mentioned
- not working
- no support
- need for tutorials
User reviews
by zsyzsykk, 2025-03-12
It's not working. waste of my time.
by Greg_rocks, 2025-02-27
by Firefox user 18463091, 2025-02-23
Add-on safety
Risk impact
Greasemonkey 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
We don't have sufficient data to confidently determine the risk likelihood of Greasemonkey. Use it at your own risk.
Risk likelihood analysis details
- Low This extension was updated more than 6 months ago. Older versions are more likely to be stable and safe.
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