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Browser Extensions · head to head

Fireshot vs Greasemonkey

Fireshot logo

Fireshot

Browser Extensions

Full webpage screenshots

From
Free
Rated
-
Full reviewWebsite
Greasemonkey logo

Greasemonkey

Browser Extensions

The original userscript manager, for Firefox

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Fireshot pro yearly license is capped at 2 devices for personal use; additional devices require a separate license purchase; Greasemonkey firefox only. There is no Chrome, Edge or Safari build and there never has been.
  • They diverge on capability: Fireshot covers Full page capture, Greasemonkey covers Userscript execution.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which Fireshot and Greasemonkey actually diverge.

Attributes where Fireshot and Greasemonkey differ
AttributeFireshotGreasemonkey
Pricing modelfreemiumopen-source
PlatformsChrome, Firefox, Edge, OperaFirefox
Founded2007Unknown

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 Fireshot

  • Full page capture
  • Multiple formats
  • Annotation
  • Direct upload
  • Chrome support
  • Firefox support
  • Edge support
  • Opera support

Only in Greasemonkey

  • Userscript execution
  • Built-in script editor
  • GM. API
  • @resource support
  • Script localisation
  • Firefox for Android

What people use each for

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

Fireshot

  • Capturing and annotating full-page screenshots of web pagesnot Greasemonkey

Greasemonkey

  • Restyling or de-cluttering a site you use dailynot Fireshot
  • Automating a repetitive action on a web applicationnot Fireshot
  • Adding a missing feature to a site you do not controlnot Fireshot
  • Running userscripts on Firefox for Androidnot Fireshot
  • Writing and testing your own scripts in the browsernot Fireshot

Where each one falls short

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

Fireshot

  • Pro yearly license is capped at 2 devices for personal use; additional devices require a separate license purchase

Greasemonkey

  • Firefox only. There is no Chrome, Edge or Safari build and there never has been.
  • Its API diverged from the Tampermonkey conventions most shared scripts are written against, so a script from a sharing site may need adjusting to run.
  • The dashboard is plainer than Tampermonkey's, with no diff view when a script updates itself.
  • No cloud sync of the kind Tampermonkey and Violentmonkey offer; moving machines means exporting.
  • A userscript manager can read and rewrite every page you visit, so the security of the arrangement depends entirely on the scripts you choose to install.

Pricing, plan by plan

Fireshot

Free
  • FreeFree
    • Full page capture
    • PNG/JPEG export
    • Basic annotation

Greasemonkey

Free
  • Open sourceFree
    • Unlimited scripts
    • Built-in editor
    • No account required

Which should you pick?

Choose Fireshot if

  • You need full page capture.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Opera.
  • You also want multiple formats.
Fireshot review

Choose Greasemonkey if

  • You need userscript execution.
  • You want to start without paying.
  • You work on Firefox.
  • You also want built-in script editor.
Greasemonkey review

Questions people ask

Is Fireshot or Greasemonkey better?
Neither clearly leads. Fireshot starts at Free and Greasemonkey at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Fireshot or Greasemonkey?
Fireshot starts at Free and Greasemonkey at Free.
Does Fireshot or Greasemonkey run on more platforms?
Fireshot runs on Chrome, Firefox, Edge, Opera. Greasemonkey runs on Firefox.
Can I use Fireshot for free?
Both have a free tier, so you can try either at no cost before committing.
What is Fireshot best used for?
Fireshot is most often used for capturing and annotating full-page screenshots of web pages. Of those, capturing and annotating full-page screenshots of web pages is not what Greasemonkey is typically brought in for.
What can Fireshot do that Greasemonkey cannot?
Fireshot covers Full page capture, Multiple formats, Annotation, Direct upload. Greasemonkey covers Userscript execution, Built-in script editor, GM. API, @resource support.

Answered from the vendors’ own pages

Greasemonkey: Is Greasemonkey still maintained?

Yes. Version 4.14 was released on 2 June 2026, and the project has an active repository, bug tracker and discussion groups.

Source
Greasemonkey: Does Greasemonkey work on Chrome?

No. It is a Firefox extension and has never shipped for Chrome. Violentmonkey and Tampermonkey are the equivalents there.

Source
Greasemonkey: Will Tampermonkey scripts run in Greasemonkey?

Often, but not always. Greasemonkey's API diverged from the conventions most shared scripts are written against, so a script may need its header or its GM calls adjusted.

Source
Greasemonkey: Does Greasemonkey run on mobile?

On Firefox for Android, from version 4.12. There is no iOS build, because Firefox on iOS cannot load extensions of this kind.

Source
Greasemonkey: What is the GM API?

The set of functions a userscript manager exposes to scripts, named after Greasemonkey, which defined it. Greasemonkey supports the promise-based GM. form including GM.xmlHttpRequest and GM.registerMenuCommand.

Source
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