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Browser Extensions · head to head

FireMonkey vs Tampermonkey

FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite
Tampermonkey logo

Tampermonkey

Browser Extensions

The most popular userscript manager

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: FireMonkey firefox only, and requires a recent one: version 93 on desktop, 113 on Android.; Tampermonkey only source code up to version 2.9 is GPLv3; all newer versions are distributed under a proprietary license despite the extension itself being free to use
  • They diverge on capability: FireMonkey covers Scripts and styles together, Tampermonkey covers Userscript management.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which FireMonkey and Tampermonkey actually diverge.

Attributes where FireMonkey and Tampermonkey differ
AttributeFireMonkeyTampermonkey
PlatformsFirefoxWeb, Windows, macOS, Linux, Android
FoundedUnknown2010

Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), user rating (Not yet rated), category (Browser Extensions).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in FireMonkey

  • Scripts and styles together
  • Monaco editor with ESLint
  • Unlimited client-side storage
  • Global injection
  • Notifications and clipboard
  • Firefox for Android

Only in Tampermonkey

  • Userscript management
  • Script editor
  • Auto-update
  • Cloud sync
  • Chrome support
  • Firefox support
  • Edge support
  • Safari support

What people use each for

The jobs each tool is most often brought in to do.

FireMonkey

  • Running user scripts and user styles without two separate extensionsnot Tampermonkey
  • Restyling sites with CSS alongside scripted behaviour changesnot Tampermonkey
  • Editing scripts in a full editor inside the browsernot Tampermonkey
  • Injecting CSS globally across every sitenot Tampermonkey
  • Managing a mixed library of scripts and styles from one dashboardnot Tampermonkey

Tampermonkey

  • Auto-run custom JavaScript to add features to specific websitesnot FireMonkey
  • Block ads, remove clutter, or reformat page layout via community/personal userscriptsnot FireMonkey
  • Run scripts sourced from Greasy Fork or similar userscript repositoriesnot FireMonkey
  • Automate repetitive web tasks such as form-filling or redirect skipping via installed scriptsnot FireMonkey

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

FireMonkey

  • Firefox only, and requires a recent one: version 93 on desktop, 113 on Android.
  • Not a drop-in replacement for Greasemonkey, Tampermonkey or Stylus. The project says so itself, so an existing library may need adjusting.
  • A much smaller user base than Tampermonkey or Violentmonkey, which means fewer people have hit the bug you are about to hit.
  • No Chrome, Edge or Safari build, so it cannot be the answer for anyone working across browsers.
  • Combining scripts and styles in one extension also combines the blast radius: one extension with permission to inject both into every page.

Tampermonkey

  • Only source code up to version 2.9 is GPLv3; all newer versions are distributed under a proprietary license despite the extension itself being free to use
  • Under Manifest V3, GM_webRequest is not (yet) supported
  • Under Manifest V3, GM_xmlhttpRequest fires only one progress event instead of streaming progress, requiring a responseType: 'stream' workaround
  • Since v5.3.2, Chrome/Edge (MV3) requires the user to manually enable Developer Mode, or from Chrome 138+ a per-extension 'Allow User Scripts' toggle, before any userscript will run

Pricing, plan by plan

FireMonkey

Free
  • Open sourceFree
    • MPL-2.0 licensed
    • Unlimited scripts and styles
    • No account required

Tampermonkey

Free

No published plan breakdown. See the Tampermonkey review.

Which should you pick?

Choose FireMonkey if

  • You need scripts and styles together.
  • You want to start without paying.
  • You work on Firefox.
  • You also want monaco editor with eslint.
FireMonkey review

Choose Tampermonkey if

  • You need userscript management.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux, Android.
  • You also want script editor.
Tampermonkey review

Questions people ask

Is FireMonkey or Tampermonkey better?
Neither clearly leads. FireMonkey starts at Free and Tampermonkey at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FireMonkey or Tampermonkey?
FireMonkey starts at Free and Tampermonkey at Free.
Does FireMonkey or Tampermonkey run on more platforms?
FireMonkey runs on Firefox. Tampermonkey runs on Web, Windows, macOS, Linux, Android.
Can I use FireMonkey for free?
Both have a free tier, so you can try either at no cost before committing.
What is FireMonkey best used for?
FireMonkey is most often used for running user scripts and user styles without two separate extensions, restyling sites with css alongside scripted behaviour changes, editing scripts in a full editor inside the browser, injecting css globally across every site. Of those, running user scripts and user styles without two separate extensions and restyling sites with css alongside scripted behaviour changes are not what Tampermonkey is typically brought in for.
What can FireMonkey do that Tampermonkey cannot?
FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection. Tampermonkey covers Userscript management, Script editor, Auto-update, Cloud sync.

Answered from the vendors’ own pages

FireMonkey: What makes FireMonkey different from Violentmonkey?

It manages user styles as well as user scripts. The usual arrangement is a script manager plus a separate style manager such as Stylus; FireMonkey replaces both with one extension.

Source
Tampermonkey: How much does Tampermonkey cost?

Tampermonkey is completely free for all versions and across all supported browsers including Chrome, Edge, Safari, Opera, and Firefox.

Source
FireMonkey: Which browsers does FireMonkey support?

Firefox only. Desktop requires Firefox 93 or later and Android requires 113, with an API minimum of 102.

Source
Tampermonkey: Is Tampermonkey available on all browsers?

Yes, Tampermonkey is available on Chrome 120 and later, Microsoft Edge, Safari, Opera Next, and Firefox with no cost.

Source
FireMonkey: Is FireMonkey open source?

Yes, under the MPL-2.0 licence.

Source
FireMonkey: Will my existing Tampermonkey scripts work?

Not necessarily. The project states that while it shares functionality with Greasemonkey, Tampermonkey and Stylus, there are differences, so scripts and styles written for those may need adjusting.

Source
FireMonkey: What editor does FireMonkey use?

Current versions use the Monaco editor with ESLint, the same editor component that powers VS Code.

Source
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