Extension source viewer

Extension source viewer

View source code of Firefox add-ons and Chrome extensions (crx/nex/xpi) from addons.mozilla.org, the Chrome Webstore and elsewhere, with CRX Viewer (crxviewer).

  • Extension source viewer
  • Extension source viewer
What is Extension source viewer?
Extension source viewer is a versatile Firefox add-on that detects browser extensions and allows users to view and download their source code. Its features include code beautification, syntax highlighting, option to filter files, search functionality, image previews and more. It's also capable of downloading extensions from different platforms as well as viewing the contents of any URL or zip file.
By: Rob W
Users: 1,759 ▲ 16
Rating: 4.79 (107)
Version: 1.7.0 (Last updated: 2023-12-10)
Creation date: 2016-07-24
Weekly download count: 51
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
  • tabs
  • storage
  • contextMenus
  • downloads
  • alarms
  • cookies
  • webRequest
  • webRequestBlocking
  • *://*/*
Size: 247.50K
URLs: Website
Stats date:

Other platforms

Chrome extension source viewer
Chrome extension source viewer (v1.7.0)
4.59 (416) 100,000
Not available on Edge
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Adds a button to right of the address bar when a Firefox add-on or Chrome extension is detected. This also includes extensions for the Opera and Edge browsers and Thunderbird. This button shows two options:

  • Download extension as zip file
  • View source

The default action (showing the above options) can be changed via the "Primary action on click" menu that appears when you right-click on the extension button.

It also adds a context menu item on Firefox and Chrome extension links.

The "View source" option opens a new tab with a simple viewer, with the following features:

  • Download-as-zip and download-as-crx at the upper-right corner.
  • List of file names, and the option to filter files with a regular expression.
See more
User reviews
User reviews summary
These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
  • Allows inspection of add-on code before installation.
  • Increases transparency by showing what services an add-on may be calling.
  • Useful for verifying whether an addon is potentially malicious.
  • Handy and practical for use with Firefox.
  • Does not work properly with Waterfox Classic.
  • Some users experience issues with the CRX icon not appearing.
  • Installation issues, requiring the old version to be uninstalled before updating.
Most mentioned
  • Useful for reviewing add-on code
  • Certain compatibility issues with Waterfox Classic
  • Must sometimes reinstall to update correctly
Recent reviews
by geeknik, 2024-04-25

by geeknik, 2024-04-25

by geeknik, 2024-04-25
View all user reviews
Risk impact

Extension source viewer is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Extension source viewer if you trust the publisher.

Risk likelihood

Extension source viewer is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Upgrade to see risk analysis details