Softwr

Browser Extensions · head to head

FireMonkey vs SimilarWeb

FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite
SimilarWeb logo

SimilarWeb

Browser Extensions

Website traffic and competitive analysis

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.; SimilarWeb browser extension data accuracy is lower than full platform
  • They diverge on capability: FireMonkey covers Scripts and styles together, SimilarWeb covers Traffic analytics.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which FireMonkey and SimilarWeb actually diverge.

Attributes where FireMonkey and SimilarWeb differ
AttributeFireMonkeySimilarWeb
Pricing modelopen-sourcefreemium
PlatformsFirefoxWeb, Browser Extension
FoundedUnknown2007

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 SimilarWeb

  • Traffic analytics
  • Audience insights
  • Competitor research
  • Industry analysis
  • 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 SimilarWeb
  • Restyling sites with CSS alongside scripted behaviour changesnot SimilarWeb
  • Editing scripts in a full editor inside the browsernot SimilarWeb
  • Injecting CSS globally across every sitenot SimilarWeb
  • Managing a mixed library of scripts and styles from one dashboardnot SimilarWeb

SimilarWeb

  • Analyzing competitor advertising across display, search, socialnot FireMonkey
  • Understanding traffic loss to search and AI recommendationsnot FireMonkey
  • Tracking brand visibility across ChatGPT and AI chatbotsnot FireMonkey
  • Optimizing Amazon product placement with marketplace analyticsnot FireMonkey
  • Identifying high-intent prospects at optimal buying momentsnot 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.

SimilarWeb

  • Browser extension data accuracy is lower than full platform
  • Full platform pricing is not transparent and requires quote-based inquiry

Pricing, plan by plan

FireMonkey

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

SimilarWeb

Free
  • FreeFree
    • Traffic overview
    • Engagement metrics
    • Similar sites

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 SimilarWeb if

  • You need traffic analytics.
  • You want to start without paying.
  • You work on Web, Browser Extension.
  • You also want audience insights.
SimilarWeb review

Questions people ask

Is FireMonkey or SimilarWeb better?
Neither clearly leads. FireMonkey starts at Free and SimilarWeb at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FireMonkey or SimilarWeb?
FireMonkey starts at Free and SimilarWeb at Free.
Does FireMonkey or SimilarWeb run on more platforms?
FireMonkey runs on Firefox. SimilarWeb runs on Web, Browser Extension.
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 SimilarWeb is typically brought in for.
What can FireMonkey do that SimilarWeb cannot?
FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection. SimilarWeb covers Traffic analytics, Audience insights, Competitor research, Industry analysis.

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
SimilarWeb: How much does Similarweb cost?

Similarweb does not publish pricing. Custom packages are available for businesses and enterprises. Self-service options are available for entrepreneurs and small teams. Customers must start a free trial or contact sales to receive a quote.

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
SimilarWeb: Does Similarweb offer a free trial?

Yes. Similarweb offers free trials for its various products. Users can start a free trial through their registration page or contact support to switch between different product trials.

Source
FireMonkey: Is FireMonkey open source?

Yes, under the MPL-2.0 licence.

Source
SimilarWeb: What products does Similarweb offer?

Similarweb offers the Competitive Intelligence Suite, Strategic SEO Suite, Ads Intelligence Suite, Gen AI Intelligence Suite, AI Studio with natural language queries, custom data feeds, API access, and managed services with custom dashboards.

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
Share

Related pages

More on FireMonkey

More on SimilarWeb

Keep looking

Other head to heads