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Block A/B Testing (YouTube) version history - 7 versions

Block A/B Testing (YouTube) by Arzuparreta

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Block A/B Testing (YouTube) version history - 7 versions
  • Be careful with old versions! These versions are displayed for testing and reference purposes.You should always use the latest version of an add-on.

  • Latest version

    Version 2.4.0

    Released Jul 3, 2026 - 202 KB
    Works with firefox 140.0 and later, android 142.0 and later
    • Patch Notes v2.4.0

    Fixed occasional YouTube lag and title/thumbnail mismatches.

    This update changes how the extension works internally: it now intercepts YouTube video data in the page context before YouTube renders it,
    instead of relying heavily on DOM corrections after render. This makes title and thumbnail pinning more reliable and reduces unnecessary work on
    dynamic YouTube pages.

    Changes:
    • Improved reliability for pinned titles and thumbnails.
    • Reduced risk of wrong thumbnails or titles appearing on recycled YouTube cards.
    • Reduced DOM fallback scanning to lower performance impact.
    • Updated Chrome and Firefox store packages for version 2.4.0.

    Source code released under Mozilla Public License 2.0

    Download Firefox and get the extension
    Download file
  • Older versions

    Version 2.3.0

    Released Jun 18, 2026 - 200.89 KB
    Works with firefox 140.0 and later, android 142.0 and later
    v2.3.0

    • New: a toolbar menu to turn the extension on or off with a single switch.
    • While off, the extension fully pauses — it stops pinning and no longer saves new titles or thumbnails.
    • Turning it back on instantly re-applies your pinned titles and thumbnails on the current page.
    • Your saved pins are kept while disabled, so nothing is lost.
    • Added a link to the project on GitHub from the menu.

    Source code released under Mozilla Public License 2.0

    Download file
  • Version 2.2.2

    Released Jun 17, 2026 - 197.66 KB
    Works with firefox 140.0 and later, android 142.0 and later
    v2.2.2

    Rebuilt the title/thumbnail pinning engine from the ground up. Instead of
    scraping the DOM after YouTube renders (which was fragile, slow, and prone to
    cross-video title leaks), the extension now intercepts YouTube's internal API
    responses and pins the first-seen title and thumbnail BEFORE YouTube renders them.
    • Zero DOM observers (was 5 continuous MutationObservers)
    • Covers all YouTube surfaces (watch, shorts, search, home, channels, playlists,
      sidebar — anything that goes through /youtubei/v1/ is intercepted)
    • In-memory pin cache removes per-frame storage reads; pin application is
      synchronous inside the network layer
    • Dramatically fewer race conditions — no card recycling guards, no tentative
      gates, no generation counters
    • Same privacy: everything stays in local browser storage, zero data collection

    Source code released under Mozilla Public License 2.0

    Download file
  • Version 2.2.1

    Released Jun 10, 2026 - 198.89 KB
    Works with firefox 140.0 and later, android 142.0 and later
    Various fixes that complement and close the issues adressed in the last update.

    Source code released under Mozilla Public License 2.0

    Download file
  • Version 2.2.0

    Released Jun 9, 2026 - 197.95 KB
    Works with firefox 140.0 and later, android 142.0 and later
    Fixed a case where some titles would remain in screen.
    Fixed memory accumulating infinitely with an automatic cleanup and a tight limit for optimal behavior.
    Removed unnecesary refreshes that did not apply to the current endopint the user is looking at.
    Various performance and architecture refactors for stability and performance.

    Source code released under Mozilla Public License 2.0

    Download file
  • Version 2.1.0

    Released May 6, 2026 - 194 KB
    Works with firefox 140.0 and later, android 142.0 and later
    Functionality extended to also pin A/B tested thumbnails, as well as video titles. Same idea, same logic, just extended to thumbnails.

    Source code released under Mozilla Public License 2.0

    Download file
  • Version 2.0.4

    Released Mar 30, 2026 - 190.86 KB
    Works with firefox 140.0 and later, android 142.0 and later

    Source code released under Mozilla Public License 2.0

    Download file
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