"This is the first public release of Firefox for eCS (OS/2) since quite an outdated version 10.0.12 (released January, 2013). The major change in this release (compared to 10.x) is implementation of eCS (OS/2)-specific parts for the new IPC mechanism which is used for the Content Processes feature (that allows to run plugins in separate processes to improve browser stability and performance).
This is a beta release meaning that not all functions work properly."
So please bear that in mind if and how you decide to test this.
See the web page for notes, downloads and requirements.
"If you find a bug (which is likely), please create an issue at the issues page. But before you create a new issue, be sure it is not already reported by searching through the existing ones using the Search field at the top of this page." https://github.com/bitwiseworks/mozilla-os2/issues
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