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Browser Extensions · head to head

FireMonkey vs Logseq

FireMonkey logo

FireMonkey

Browser Extensions

User scripts and user styles in one Firefox extension

From
Free
Rated
-
Full reviewWebsite
Logseq logo

Logseq

Content Creation

Free open-source note-taking with linked thoughts

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.; Logseq aGPL-3.0 licensing requires derivative works to be open-source
  • They diverge on capability: FireMonkey covers Scripts and styles together, Logseq covers Markdown-based notes.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which FireMonkey and Logseq actually diverge.

Attributes where FireMonkey and Logseq differ
AttributeFireMonkeyLogseq
PlatformsFirefoxmacOS, Linux, Windows, iOS, Android, Web
CategoryBrowser ExtensionsContent Creation
FoundedUnknown2020

Identical on both: starting price (Free), pricing model (open-source), 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 Logseq

  • Markdown-based notes
  • Bidirectional linking
  • Graph visualization
  • Backlinks
  • Tags
  • Daily notes
  • Journaling
  • Search and filtering

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

Logseq

  • Privacy-first knowledge management with local data storagenot FireMonkey
  • Open-source alternative to proprietary note-taking platformsnot FireMonkey
  • Markdown and Org-mode file support with PDF annotationnot FireMonkey
  • Extensible through plugin ecosystem for custom workflowsnot 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.

Logseq

  • AGPL-3.0 licensing requires derivative works to be open-source
  • Mobile apps (iOS and Android) still in alpha/beta development stage
  • Self-hosted with local-first architecture, no built-in cloud sync option
  • No native synchronisation between desktop and mobile versions without setup

Pricing, plan by plan

FireMonkey

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

Logseq

Free

No published plan breakdown. See the Logseq 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 Logseq if

  • You need markdown-based notes.
  • You want to start without paying.
  • You work on macOS, Linux, Windows, iOS, Android, Web.
  • You also want bidirectional linking.
Logseq review

Questions people ask

Is FireMonkey or Logseq better?
Neither clearly leads. FireMonkey starts at Free and Logseq at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FireMonkey or Logseq?
FireMonkey starts at Free and Logseq at Free.
Does FireMonkey or Logseq run on more platforms?
FireMonkey runs on Firefox. Logseq runs on macOS, Linux, Windows, iOS, Android, Web.
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 Logseq is typically brought in for.
What can FireMonkey do that Logseq cannot?
FireMonkey covers Scripts and styles together, Monaco editor with ESLint, Unlimited client-side storage, Global injection. Logseq covers Markdown-based notes, Bidirectional linking, Graph visualization, Backlinks.

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
Logseq: How much does Logseq cost?

Logseq is a free, open-source privacy-first knowledge base with no paid tiers or hidden costs. The software is available to download and use at no charge.

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
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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