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CSS Exfil Protection

This is the official repository for the CSS Exfil Protection plugins for Chrome and Firefox.

If reporting bugs please include the steps to replicate. Useful information includes:

  • URL which triggers the error
  • Expected result
  • Actual result

Information about the plugins and the CSS Exfil attack can be found here:

The plugin was named a Firefox 🌟 Featured Extension in April 2019!

Firefox Rating Chrome Rating

Release notes

Version 1.1.0

Released Aug. 24, 2020

  • Big update, which moves the project to a 1.1.0 point release
  • For Chrome 85 compatibility: Migrating AJAX xhr requests for cross-domain stylesheets to background.js (behavior in Firefox is unchanged)
  • Perform disabled check earlier in execution to prevent any interaction by plugin with websites when disabled
  • Firefox bugfix: CSS load blocking styles are applied/removed in a different manner, which avoids breaking default styled input elements
  • Style enhancements to popup.html
  • NEW user controlled domain settings! Users can now control scan and sanitize based on a site-by-site basis. Have a problem with a site? Disable either scan and/or sanitize and the plugin will avoid interaction with any CSS loaded by the website. Bug reports for site-related problems are still welcome!

Version 1.0.17

Released Oct. 15, 2019

  • Added a privacy policy due to the new Chrome Addon Store policy
  • Integrated polyzen's patch to allow for Firefox addon side-loading (for Arch Linux AUR repository)

Version 1.0.16

Released Aug. 7, 2019

  • Integrated aelisya's patches to add dark theme support and increased target link security

Version 1.0.15

Released Jun. 22, 2019

  • Bugfix to remove debug logs in Firefox (reported by unsmell)
  • Version bumped for Chrome to keep version parity, but no other edits to Chrome plugin.

Version 1.0.14

Released Jun. 17, 2019

  • Bugfix to properly scan relative path cross-domain stylesheets includes (issue #14) (reported by Firefox user CStark)
  • Bugfix for documents lacking a head section (e.g. when loading a PDF in browser)

Version 1.0.12

Released Jan. 4, 2019

  • Improved disabled icon state and adding reenabled icon state (incorporates suggestions from B00ze64)

Version 1.0.11

Released Nov. 20, 2018

  • Bugfix release to allow plugin to sanitize pages loaded within frames/iframes (as reported by D)

Version 1.0.10

Released Nov. 19, 2018

  • New icons
  • Disabled status indicator
  • Bugfix to better handle alternative stylesheet sanitation (as reported by NN & Firefox reviewer)
  • Chrome plugin to receive timeout checks for cross domain resources (similar to what Firefox has had)
  • Master branch reverts for experimental code that was within git but never released

Version 1.0.8

Released March 6, 2018

  • Bugfix release to improve scanning of cross-domain stylesheets

Version 1.0.7

Released March 1, 2018 Integrates several bugfixes which increase performance and provide better sanitization, including:

  • Added null check on rules before scanning
  • Fix indexOf bug reported by mrjacobbloom
  • Integrate earthlng patch

Version 1.0.5

Released Feb. 14, 2018

  • Added blocking protection for content:url()
  • Fix blocking logic bug
  • Bugfix to prevent false positive on xmlns='http://

Version 1.0.4

Released Feb. 9, 2018

  • Added badge support to show block count
  • Bugfix for Firefox error triggered in certain cases
  • Better handling to ensure cross-domain resources are not scanned more than once per load

Version 1.0.2

Released Feb. 7, 2018

  • Fixes bug triggered by using alongside certain ad-block plugins (as reported by bied)

Version 1.0.1

Released Feb. 6, 2018

  • Firefox compatibility improvements across multiple platforms.

Version 1.0.0

Released Feb. 6, 2018

  • Initial release