With the [release of Puppeteer 23.0.1](https://github.com/puppeteer/puppeteer/releases/tag/puppeteer-core-v23.0.1) from August 7th Firefox is now fully supported starting with version 129 by using the WebDriver BiDi protocol by default. That means all the work related to this specific meta bug is now done and as such I'm going to close it out.
Bug 1858188 Comment 4 Edit History
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With the [release of Puppeteer 23.0.1](https://github.com/puppeteer/puppeteer/releases/tag/puppeteer-core-v23.0.1) from August 7th [Firefox is now fully supported starting with version 129 by using the WebDriver BiDi protocol by default](https://hacks.mozilla.org/2024/08/puppeteer-support-for-firefox/). That means all the work related to this specific meta bug is now done and as such I'm going to close it out.