Roadmap to Echelon release 2.0

[travy-patty]

In November 2024, I decided to rewrite Echelon in hopes for more accuracy, better implementations of features, and support for newer versions of Firefox such as 128esr and 133. Since then, the Echelon rewrite has made long strides and a release gets more closer. But for now, these are some issues/features that I want to add or fix before I consider Echelon "release-ready".

• Support for Firefox 115-latest (near-complete 115esr and 128esr support)
• Better first install experience
• New Tabs page implementation
• Browser Pages styling (Preferences, Add-ons and Themes, Error Pages, mostly any page with the about: prefix)
• More complete lightweight theme support
• Linux/macOS support
• Styling of many Firefox menu popups
• Minuscule details missing from rewrite that were in old code base