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Browser Extensions · head to head

FireMonkey vs Momentum

FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite
Momentum logo

Momentum

Browser Extensions

Personal dashboard for focus and inspiration

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.; Momentum free version lacks advanced task manager integrations available in Plus tier
  • They diverge on capability: FireMonkey covers Scripts and styles together, Momentum covers Daily photos.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which FireMonkey and Momentum actually diverge.

Attributes where FireMonkey and Momentum differ
AttributeFireMonkeyMomentum
Pricing modelopen-sourceUnknown
PlatformsFirefoxChrome, Firefox, Safari, Microsoft Edge, macOS (native app)
FoundedUnknown2013

Identical on both: starting price (Free), 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 Momentum

  • Daily photos
  • Weather widget
  • Todo list
  • Daily focus
  • Chrome support
  • Firefox support
  • Edge 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 Momentum
  • Restyling sites with CSS alongside scripted behaviour changesnot Momentum
  • Editing scripts in a full editor inside the browsernot Momentum
  • Injecting CSS globally across every sitenot Momentum
  • Managing a mixed library of scripts and styles from one dashboardnot Momentum

Momentum

  • Setting daily focus goals from a browser new tabnot FireMonkey
  • Creating focus modes with timers and productivity soundsnot FireMonkey
  • Maintaining priority to-do lists with completion trackingnot 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.

Momentum

  • Free version lacks advanced task manager integrations available in Plus tier
  • Habit tracking and metrics features only available in paid plan
  • Limited customization options in free version compared to premium tier
  • Syncing with external task managers requires Plus subscription

Pricing, plan by plan

FireMonkey

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

Momentum

Free
  • FreeFree
    • Daily focus
    • To-do lists
    • Weather and links
  • Momentum Plus$undefined/mo
    • Unlimited Focus Mode
    • Vision board creation
    • Tab Stash functionality

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 Momentum if

  • You need daily photos.
  • You want to start without paying.
  • You work on Chrome, Firefox, Safari, Microsoft Edge, macOS (native app).
  • You also want weather widget.
Momentum review

Questions people ask

Is FireMonkey or Momentum better?
Neither clearly leads. FireMonkey starts at Free and Momentum at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FireMonkey or Momentum?
FireMonkey starts at Free and Momentum at Free.
Does FireMonkey or Momentum run on more platforms?
FireMonkey runs on Firefox. Momentum runs on Chrome, Firefox, Safari, Microsoft Edge, macOS (native app).
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 Momentum is typically brought in for.
What can FireMonkey do that Momentum cannot?
FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection. Momentum covers Daily photos, Weather widget, Todo list, Daily focus.

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
Momentum: Is Momentum free?

Momentum offers a free version with core features like daily focus, to-do lists, weather, and motivational quotes. Premium features are available through Momentum Plus subscription.

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
Momentum: What is Focus Mode in Momentum?

Focus Mode displays your main daily objective on the new tab page to keep you centered on your primary task and reduce distractions throughout your workday.

Source
FireMonkey: Is FireMonkey open source?

Yes, under the MPL-2.0 licence.

Source
Momentum: Does Momentum integrate with task managers?

Yes. Momentum Plus integrates with popular task managers including Todoist, Asana, and ClickUp, allowing seamless synchronization of your tasks.

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
Momentum: What platforms does Momentum support?

Momentum is available on Chrome, Firefox, Safari, and Microsoft Edge as a browser extension, with a native macOS app also available.

Source
FireMonkey: What editor does FireMonkey use?

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

Source
Momentum: Does Momentum Plus include soundscapes?

Yes. Momentum Plus subscribers get access to Focus Mode soundscapes designed for concentration and deep work, along with other premium features.

Source
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