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Browser Extensions · head to head

FireMonkey vs OBS Studio

FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite
OBS Studio logo

OBS Studio

Content Creation

Free and open source software for video recording and live streaming

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.; OBS Studio the Windows build supports only Windows 10 and 11
  • They diverge on capability: FireMonkey covers Scripts and styles together, OBS Studio covers Real-time video/audio capturing.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which FireMonkey and OBS Studio actually diverge.

Attributes where FireMonkey and OBS Studio differ
AttributeFireMonkeyOBS Studio
Pricing modelopen-sourcefree
PlatformsFirefoxWindows, Macos, Linux
CategoryBrowser ExtensionsContent Creation
FoundedUnknown2012

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 OBS Studio

  • Real-time video/audio capturing
  • Scene composition
  • Audio mixer with filters
  • Configuration options
  • Modular 'Dock' UI
  • Studio mode
  • Plugin support
  • Streaming to multiple platforms

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 OBS Studio
  • Restyling sites with CSS alongside scripted behaviour changesnot OBS Studio
  • Editing scripts in a full editor inside the browsernot OBS Studio
  • Injecting CSS globally across every sitenot OBS Studio
  • Managing a mixed library of scripts and styles from one dashboardnot OBS Studio

OBS Studio

  • Live streaming gameplay or a desktop to Twitch or YouTubenot FireMonkey
  • Recording screen and webcam locallynot FireMonkey
  • Compositing multiple video and audio sources into scenesnot 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.

OBS Studio

  • The Windows build supports only Windows 10 and 11
  • The macOS build requires macOS 13.0 or newer
  • Linux support is distributed as a Flatpak and as a PPA for Ubuntu 24.04 and later rather than official packages for other distributions
  • Game Capture is a Windows only source

Pricing, plan by plan

FireMonkey

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

OBS Studio

Free
  • FreeFree
    • Unlimited recording time
    • Live streaming to platforms
    • Scene composition

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 OBS Studio if

  • You need real-time video/audio capturing.
  • You want to start without paying.
  • You work on Windows, Macos, Linux.
  • You also want scene composition.
OBS Studio review

Questions people ask

Is FireMonkey or OBS Studio better?
Neither clearly leads. FireMonkey starts at Free and OBS Studio at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FireMonkey or OBS Studio?
FireMonkey starts at Free and OBS Studio at Free.
Does FireMonkey or OBS Studio run on more platforms?
FireMonkey runs on Firefox. OBS Studio runs on Windows, Macos, Linux.
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 OBS Studio is typically brought in for.
What can FireMonkey do that OBS Studio cannot?
FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection. OBS Studio covers Real-time video/audio capturing, Scene composition, Audio mixer with filters, Configuration options.

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
OBS Studio: How much does OBS Studio cost?

OBS Studio is completely free to use for all users, whether for personal or professional purposes.

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
OBS Studio: Is OBS Studio open source?

Yes, OBS Studio is free and open source software for video recording and live streaming, maintained by community contributors.

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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