rs_vimium

The hacker's browser, in Rust.

Keyboard-first browser runtime and web superpowers built in Rust/WASM with Crepuscularity.

Build

bun run build

Load dist/unpacked/ as an unpacked extension in chrome://extensions. Set CREPUS_BIN=/path/to/crepus for the benchmark script if you want a different CLI binary. For Firefox output, run crepus webext build --app . --browser firefox and load dist/firefox/manifest.json in about:debugging#/runtime/this-firefox.

The web-extension build uses the workspace release profile:

Setting	Value
opt-level	s
lto	true
codegen-units	1
strip	true

Benchmark

bun run benchmark

The benchmark builds dist/unpacked, launches fresh Chrome for Testing profiles, and compares user-facing browser-action TTAs between rs_vimium and Vimium on a deterministic local page. Set CHROME_BIN to choose a browser binary. Set VIMIUM_PATH to compare against a Vimium checkout, or pass --skip-vimium.

Latest local run:

Field	Value
Date	2026-05-29T05:54:37.729Z
Browser	Google Chrome for Testing 148.0.7778.96
Machine	Mac17,9, Apple M5 Pro, arm64
CPU cores	15 physical, 15 logical
Memory	48 GiB
OS	macOS 26.5 (25F71)
Samples	3 measured, 1 warmup
Page size	160 links, 160 buttons
rs_vimium	1.2.3
Vimium	2.4.2

Browser-action TTA measures from key dispatch to observable scroll or DOM state.

Action	rs_vimium median	rs_vimium p90	Vimium median	Vimium p90
j scroll	7.9 ms	8.4 ms	40.5 ms	41.8 ms
f link hints	6.0 ms	6.9 ms	19.6 ms	22.7 ms
o vomnibar	2.1 ms	2.4 ms	2.8 ms	24.9 ms
? help	3.1 ms	3.9 ms	2.4 ms	2.8 ms
/ find	1.7 ms	2.2 ms	1.8 ms	2.0 ms

Layout

Path	Role
crepus.toml	Extension manifest (capabilities, content scripts, pages)
runtime/	Rust/WASM (popup_main, content_main, options_main, new_tab_main)
pages/	Extension pages (.crepus → HTML at build time)
views/ui.crepus	In-page UI templates (hints, vomnibar, find bar, help overlay)
src/content.css.crepus	Content-script styles (compiled to src/content.css)
resources/tlds.txt	TLD list for URL detection
icons/	Toolbar and extension icons

New tab page

With default settings, rs_vimium overrides the browser new-tab page (chrome_url_overrides.newtab → pages/new-tab.html). Change this under Options → New tab page.

License

MPL-2.0 — see LICENSE.