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Add-ons for Firefox (en-US) Review

Worth it

Should I use Add-ons for Firefox (en-US)?

Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more. - addons.mozilla.org

· 1 month ago

Use it if you browse with Firefox — it's Mozilla's official, free extension store with a huge catalog. Skip it if you're on Chrome, Edge, or Safari, or if you expect vetted, enterprise-grade quality; every extension is only as good as its volunteer developer.

Confidence

Medium. Based on 20+ public sources: AMO official pages, per-extension user reviews, and Wikipedia. Reviews are per-extension, not store-wide.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support quality
  • Security posture

Pricing

$0

Free

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Firefox users wanting ad blocking
  • Privacy-conscious browsers
  • Password manager and tracker-blocking needs
  • People who like customizing browser appearance

Not for

  • Chrome, Edge, or Safari users — add-ons require Firefox
  • Anyone expecting curated, enterprise-vetted software
  • Teams needing central licensing or procurement controls
  • Users unwilling to vet individual extensions themselves

Gotchas - check before you buy

high

Lock-in: extensions only work in Firefox; switching browsers means rebuilding your setup

medium

Some add-ons are auto-published and unreviewed when listed — check ratings and Recommended flags first

medium

Maintenance depends on individual devs; updates can stop without notice

low

Ad blockers can conflict with sites — one breaks YouTube's playback speed menu

Pros and cons

Pros

  • Completely free marketplace; many open-source extensions
  • Huge catalog spanning privacy, shopping, search, and themes
  • Run by Mozilla, a non-profit, as the official Firefox store
  • Staff picks and Recommended badges help discovery
  • Flagship blockers like uBlock Origin praised as CPU-light

Cons

  • Requires Firefox; useless to non-Firefox browsers
  • Quality varies wildly; extensions break or get abandoned
  • Auto-published add-ons may appear before editor review
  • Popular blockers can break site features like YouTube playback

Sources & method

- 7 sources - No known vulnerabilities found in the sources reviewed.

official x3review x3news x1

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 7

    Sources

  • Analyzed

  • Value for money: 5/5. Free store, mostly free extensions
  • Ease of use: 4/5. One-click install; Firefox required first
  • Feature depth: 4/5. Extensions, themes, privacy, shopping categories
  • Support quality: 2/5. Per-developer; broken add-ons persist per reviews
  • Security posture: 3/5. Mozilla reviews exist; auto-published items listed pre-review
  • $0 Starting price Marketplace itself is free
  • Yes Free extensions Many open-source, e.g. uBlock Origin
  • Thousands Catalog size Themes alone: thousands of options
  • 2017 Policy overhaul Mozilla's major add-on changes

Pricing

Free

$0

  • Marketplace browsing and installs free
  • Many extensions open-source
  • Firefox browser required

Security

No known vulnerabilities found in the sources reviewed.

What users say

Users love free, lightweight blockers like uBlock Origin but regularly hit extensions that break, conflict with sites, or stop being maintained.

“The best thing. Does not slow Firefox at all. Minimal CPU usage”
AMO review, uBlock Origin
“Suddenly stopped working. Can't add sites to blocklist, pages on the blocklist aren't blocked consistently.”
AMO review, Block Site
“However, it's been interfering with the YouTube playback speed control menu.”
AMO review, AdBlock for Firefox
Full analysis

Based on 20+ public sources: AMO official pages, per-extension user reviews, and Wikipedia. Reviews are per-extension, not store-wide.

Free official Firefox extension store — big catalog, zero cost, but useless without Firefox and quality varies wildly.

Methodology

Based on 20+ public sources: AMO official pages, per-extension user reviews, and Wikipedia. Reviews are per-extension, not store-wide.

Read how a report is made.

Sources

  1. Add-ons for Firefox homepageaddons.mozilla.org
    official
  2. About Firefox Add-onsaddons.mozilla.org
    official
  3. Extensions directoryaddons.mozilla.org
    official
  4. uBlock Origin reviewsaddons.mozilla.org
    review
  5. Block Site reviewsaddons.mozilla.org
    review
  6. AdBlock for Firefox reviewsaddons.mozilla.org
    review
  7. Add-on (Mozilla) - Wikipediaen.wikipedia.org
    news

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