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ESLint vs Mozilla Firefox

ESLint logo

ESLint

Developer Tools

Find and fix problems in JavaScript code

From
Free
Rated
-
Full reviewWebsite
Mozilla Firefox logo

Mozilla Firefox

Technology

Fast, private & safe web browser

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ESLint slow performance on large codebases compared to newer tools like Oxlint and Biome; Mozilla Firefox no longer supported on Windows 8.1 and earlier versions (users must use Firefox ESR)

Where they differ

Only the attributes on which ESLint and Mozilla Firefox actually diverge.

Attributes where ESLint and Mozilla Firefox differ
AttributeESLintMozilla Firefox
PlatformsBrowser-based JavaScript, Node.js, Any JavaScript environmentWindows, macOS, Linux, iOS, Android
CategoryDeveloper ToolsTechnology
Founded20192004

Identical on both: starting price (Free), pricing model (Unknown), 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 ESLint

Nothing recorded that Mozilla Firefox does not also cover.

Only in Mozilla Firefox

  • Enhanced tracking protection
  • Private browsing
  • Customizable interface
  • Add-ons support
  • Cross-device sync
  • Built-in screenshot tool
  • Reader mode
  • Picture-in-picture

What people use each for

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

ESLint

  • Statically analysing JavaScript and JSX to find problems before runtimenot Mozilla Firefox
  • Automatically fixing issues with syntax-aware rewritesnot Mozilla Firefox
  • Enforcing a consistent code style across a teamnot Mozilla Firefox
  • Running as a CI step to block non-conforming codenot Mozilla Firefox
  • Writing custom rules for project-specific conventionsnot Mozilla Firefox

Mozilla Firefox

  • Open-source web browser with privacy-focused designnot ESLint
  • Automatic tracking protection and ad blocking (2000+ data trackers blocked by default)not ESLint
  • Private browsing mode for anonymous web sessionsnot ESLint
  • Built-in password managernot ESLint
  • Multi-platform synchronisation across devicesnot ESLint
  • Developer tools and debugging capabilities for web developmentnot ESLint

Where each one falls short

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

ESLint

  • Slow performance on large codebases compared to newer tools like Oxlint and Biome
  • Complexity in configuration from scratch, particularly for TypeScript support
  • Limited built-in TypeScript support, requiring separate parsers and coordination with new TypeScript features

Mozilla Firefox

  • No longer supported on Windows 8.1 and earlier versions (users must use Firefox ESR)
  • No longer supported on macOS 10.14 and earlier versions (users must use Firefox ESR)

Pricing, plan by plan

ESLint

Free

No published plan breakdown. See the ESLint review.

Mozilla Firefox

Free

No published plan breakdown. See the Mozilla Firefox review.

Which should you pick?

Choose ESLint if

  • You want to start without paying.
  • You work on Browser-based JavaScript, Node.js, Any JavaScript environment.
ESLint review

Choose Mozilla Firefox if

  • You need enhanced tracking protection.
  • You want to start without paying.
  • You work on Windows, macOS, Linux, iOS, Android.
  • You also want private browsing.
Mozilla Firefox review

Questions people ask

Is ESLint or Mozilla Firefox better?
Neither clearly leads. ESLint starts at Free and Mozilla Firefox at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ESLint or Mozilla Firefox?
ESLint starts at Free and Mozilla Firefox at Free.
Does ESLint or Mozilla Firefox run on more platforms?
ESLint runs on Browser-based JavaScript, Node.js, Any JavaScript environment. Mozilla Firefox runs on Windows, macOS, Linux, iOS, Android.
Can I use ESLint for free?
Both have a free tier, so you can try either at no cost before committing.
What is ESLint best used for?
ESLint is most often used for statically analysing javascript and jsx to find problems before runtime, automatically fixing issues with syntax-aware rewrites, enforcing a consistent code style across a team, running as a ci step to block non-conforming code. Of those, statically analysing javascript and jsx to find problems before runtime and automatically fixing issues with syntax-aware rewrites are not what Mozilla Firefox is typically brought in for.
What can ESLint do that Mozilla Firefox cannot?
Mozilla Firefox covers Enhanced tracking protection, Private browsing, Customizable interface, Add-ons support.

Answered from the vendors’ own pages

ESLint: Does ESLint automatically fix code issues?

Many problems ESLint finds can be automatically fixed via the --fix flag. ESLint fixes are syntax-aware so you won't experience errors introduced by traditional find-and-replace algorithms.

Source
Mozilla Firefox: How much does Firefox cost?

Firefox is free to download and use. No pricing tiers, subscriptions, or payment plans are offered for the standard browser.

Source
ESLint: How much does ESLint cost?

ESLint is completely free and open-source software maintained by the OpenJS Foundation. The project accepts voluntary donations from sponsors.

Source
ESLint: Can I write custom ESLint rules?

Yes. You can develop custom rules that work alongside built-in functionality through ESLint's plugin system, allowing complete customization for your project needs.

Source
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