bork

A compact fork of Floorp 12 (Firefox 152), with the AI stack deleted and the telemetry taken out.

https://borkbrowser.online — macOS, Linux, Windows.

What it is

Firefox still runs Manifest V2 extensions, so the complete uBlock Origin works here — not the declawed Lite version that Chrome's Manifest V3 forced on everyone else. That is most of the reason this exists.

The rest is what got removed and what got built on top.

Removed

• No AI. ONNX Runtime, transformers.js, wllama, openai.mjs, the model hub and both MLEngine actors are deleted from the build, not switched off. browser.ml.enable is false.
• No telemetry, no data sharing, no crash reports, no accounts.

Translation still works — it never used any of that.

What it does

Workspaces, tab stacks, tab groups, zen mode, split view, mouse gestures, side panels (notes, downloads, a local translator), a command palette on F2, an address bar that hides completely, and Chromium extension installs.

Most of that comes down from Floorp — which is the point of forking Floorp rather than Firefox directly. What this fork adds on top is the compact chrome and its theme, the Vivaldi-style workspaces and tab stacks, the zen mode rewrite, the lean urlbar, and the removals above.

Coming from Vivaldi: bork imports your Vivaldi workspaces including which tabs live in which workspace — it reads Vivaldi's own session data, so a workspace with twenty tabs arrives as a workspace with twenty tabs. Passwords, bookmarks, history and cookies import from Vivaldi, Chrome, Edge or Safari.

Keys

The chrome controls sit on ⌘⌥ (macOS) / Ctrl+Alt (Windows, Linux) rather than bare keys, so they cannot fire while you are typing into a page.

⌘⌥ + drag	move the window from anywhere on it, no title bar needed
⌘⌥A	hide or show the address bar
⌘⌥S	hide or show the panel sidebar
⌘⌥W	hide or show the workspaces rail
⌘⌥Z	zen mode — toolbars and status bar retract, leaving the page
⌘← ⌘→	back and forward (⌘[ and ⌘] also work)
F2	command palette

Double-click a tab to type a URL straight into it. With the address bar hidden this is how you navigate: Enter goes, Escape backs out. Tabs in a stack's second row do the same.

Installing

• macOS — open the DMG, drag Bork to Applications. Builds are self-signed, so first launch is right-click → Open.
• Linux — tar -xzf Bork-linux-x86_64.tar.gz && ./bork/bork
• Windows — unzip anywhere, run bork.exe. SmartScreen will grumble; More info → Run anyway.

Building

The dev workflow is orchestrated by feles-build, a Deno task.

deno task feles-build stage                      # production assets, browser in dev mode
deno task feles-build build --phase before-mach  # production assets
deno task feles-build build --phase after-mach   # post-mach injection

The Gecko runtime lives in a separate repo, bork-runtime. The full release chain — runtimes, feature layer, packaging, upload — is tools/release/production-build.sh.

Notes on the trickier internals are in docs/development/.

License

Mozilla Public License 2.0

bork is based on Floorp, which is based on Mozilla Firefox. It is not affiliated with, endorsed by, or connected to Mozilla, Ablaze or the Floorp project.

Built on

• Mozilla Firefox — MPL 2.0 — Mozilla & contributors
• Floorp — MPL 2.0 — Ablaze
• Noraneko — MPL 2.0 — NyanRus
• Firefox UI FIX (Lepton) — MPL 2.0 — black7375. No longer a dependency: the parts still used were flattened to bork's fixed configuration as skin/bork/css/engine-chrome.css and are maintained in-tree, with no upstream sync.
• Paxmod — MIT — numirias
• Fushra Pulse — MPL 2.0 — Fushra
• userChromeCSS Loader — MIT — Griever

If you maintain any of the above and your attribution is wrong or missing, open an issue and it gets fixed.