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Browser Extensions · head to head

Arc vs FireMonkey

Arc logo

Arc

Browser Extensions

Chromium-based browser organized around user workflows

From
Free
Rated
-
Full reviewWebsite
FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Arc no longer receiving active feature development as of May 2025, entering maintenance mode; FireMonkey firefox only, and requires a recent one: version 93 on desktop, 113 on Android.
  • They diverge on capability: Arc covers Spaces and Profiles, FireMonkey covers Scripts and styles together.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which Arc and FireMonkey actually diverge.

Attributes where Arc and FireMonkey differ
AttributeArcFireMonkey
Pricing modelFreeopen-source
PlatformsmacOS, Windows, iOSFirefox

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 Arc

  • Spaces and Profiles
  • Split View
  • Themes
  • Privacy-First Design
  • Chromium Updates

Only in FireMonkey

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

What people use each for

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

Arc

  • Organizing work across multiple projects within one browsernot FireMonkey
  • Separating personal and professional browsing with spacesnot FireMonkey
  • Privacy-conscious web browsing without trackingnot FireMonkey
  • Tab and window management for productivitynot FireMonkey

FireMonkey

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

Where each one falls short

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

Arc

  • No longer receiving active feature development as of May 2025, entering maintenance mode
  • Limited cross-platform availability compared to mainstream browsers
  • Smaller ecosystem of extensions compared to Chrome
  • Focused on macOS and Windows, with limited iOS support

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.

Pricing, plan by plan

Arc

Free
  • ArcFree
    • Spaces and profiles organization
    • Split view customization
    • Themes and personalization

FireMonkey

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

Which should you pick?

Choose Arc if

  • You need spaces and profiles.
  • You want to start without paying.
  • You work on macOS, Windows, iOS.
  • You also want split view.
Arc review

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

Questions people ask

Is Arc or FireMonkey better?
Neither clearly leads. Arc starts at Free and FireMonkey at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Arc or FireMonkey?
Arc starts at Free and FireMonkey at Free.
Does Arc or FireMonkey run on more platforms?
Arc runs on macOS, Windows, iOS. FireMonkey runs on Firefox.
Can I use Arc for free?
Both have a free tier, so you can try either at no cost before committing.
What is Arc best used for?
Arc is most often used for organizing work across multiple projects within one browser, separating personal and professional browsing with spaces, privacy-conscious web browsing without tracking, tab and window management for productivity. Of those, organizing work across multiple projects within one browser and separating personal and professional browsing with spaces are not what FireMonkey is typically brought in for.
What can Arc do that FireMonkey cannot?
Arc covers Spaces and Profiles, Split View, Themes, Privacy-First Design. FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection.

Answered from the vendors’ own pages

Arc: Does Arc Browser cost anything to use?

Arc is completely free to download and use with no subscription required. All features are available at no cost.

Source
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
Arc: What operating systems does Arc support?

Arc is available on macOS, Windows, and iOS. Windows and mobile versions are available for download.

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
Arc: Will Arc continue to receive new features?

As of May 2025, Arc entered maintenance mode with no new features planned. The Browser Company's focus has shifted to Dia browser, though Arc continues to receive security updates.

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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