I'm making a firefox custom theme, and researching the UI/UX history of Firefox. 1. Early (v1 ~ v3) v1~v3 are classic UI that we remember when we were in the

I'm making a firefox custom theme, and researching the UI/UX history of Firefox. 1. Early (v1 ~ v3) v1~v3 are classic UI that we remember when we were in the early 2000s. Features - Clear as the icons do only one thing - Unique color for each icon Limits - Not fused with OS UI - UI height - Contrary to the modern interface philosophy as there is no abstraction - Inconsistent icon size and texture 2. Classic (v4, 2016.10) Thus, v4.0 was released after a large-scale UI reconstruction project was launched!! It is the longest-lived UI and loved by many people. Commonly called a Classic theme. Features - Orange app button at the top left like the symbol - Calmer tone - Win7 Aero Glass support - Stop / Reload / Go with one button - Tab moved to the top Limits - Unfamiliar interface with large-scale changes 3. Australis (v29, 2014.04) Australis, which had a lot of likes and dislikes compared to Proton UI. It was a change that put a lot of effort into simplicity. Features - Curved Tab - Drag & Drop customizing UI - Change settings UI pop-up to contents(tab) format - Animation Limits - Panel UI that looks like a tablet - Remove status bar 4. Photon (v57, 2017) Photon was a generally well-received update to the UI that was used until June of this year(2021), when Proton appeared. Features - Components: List based panel and page actions, library menu - Animation: Add animation to actions of buttons, tabs, panels, etc. - Visual redesign: tabs, icons, density, etc. - Performance: improved initialization, synchronization reflow, etc. Limits - It looks a bit complicated - Only light weight themes are allowed. 5. Proton (v89, 2021.06) This is the moment I started working on themes. Features - Neatly organized menu - Icon that are pretty enough to remind of the edge - Some of animations that I like & skeleton screens - Stylish color scheme - Moderate rounding - Meticulous implementation Limits - Excessively wide padding - Remove icons from menu - Feels like a button rather than a tab with a connected look - Confusion of tab indicators - Remove page action menu in address bar - Delete bookmarks / library animations and illustrations - The icon size of the new tab contents - Changed the search bar of the new tab to be performed on the URL bar.