Historically, Iceweasel was a re-branding of Mozilla Firefox by the Debian project, with minimal modifications, in order to resolve branding disputes. Debian since discontinued Iceweasel in February of 2017 after reaching an agreement with Mozilla over the use of its trademark.
The Hyperbola Team continued the Iceweasel branding in the spirit of cultural freedom for several months. However, inconsistencies were discovered, including the use of non-free fonts in Debian's Iceweasel logo. Since Debian no longer supported Iceweasel and was encouraging users to install Mozilla Firefox Quantum, we decided to look into creating a proper fork. More Info »
After an in-depth review, it was determined that Firefox Quantum contained numerous privacy, freedom, and trademark issues, in addition to an ever expanding Google Chromium code base which breaks compatibility with previous versions. The code not only contains, but encourages the user to use numerous non-free online services, known as SaaSS (Service as a Software Substitute). We knew that we had to preserve the original code base prior to Firefox 60's drastic web-engine changes in order to preserve user-choice, privacy, and freedom.
As such, Iceweasel-UXP ?was born. We began by reviewing the Basilisk application and did code-level modifications resulting in our own branding and unique features. Basilisk in turn, is a hard-fork of Firefox 52 with multiple security and privacy improvements.
We made sure that our new application contains only free artwork, that it is free of trademark disputes, and that it is free of all known freedom issues. It is a powerful, extensible web browser with support for modern web application technologies as well as legacy addons. We actively share and contribute back to UXP in order to help both projects succeed in creating a better Internet for the user. Unlike previous Iceweasel versions, Iceweasel-UXP is not just a rebranding of Firefox. It contains a new browser engine and has it's own codebase.