Chrome extension that filters low-value comments on the BF forum. Hides "congrats!", "+1", "W", and other fluff so you can focus on substantive discussion.

The extension only runs on post pages (/posts/*) — it does nothing on the feed, settings, or other non-post pages. It also handles SPA navigation, so clicking between threads re-processes comments automatically.

Comments are filtered through a 3-phase pipeline:

1. Length filter — Comments under a configurable character threshold (default: 50) are filtered instantly.
2. Keyword filter — Pattern matching against ~80 known fluff phrases and regex patterns (congrats, amazing!, lfg, W [name], emoji-only posts, etc.). Also instant.
3. AI filter (optional) — Comments that pass the first two filters are batched into a single Claude API call for classification. One request classifies all remaining comments at once.

• Staff comments are never filtered — Comments from users with a staff badge are always shown.
• Valuable reply threads are preserved — If a low-value comment has substantive replies underneath it, the parent comment stays visible to preserve thread context.
• Replies to valuable comments are kept — If a parent comment is substantive, all of its replies stay visible regardless of their individual content. This preserves conversational context.

Filtered comments are hidden and a single summary bar appears at the top of the comment list:

Show 7 filtered comments

Click to reveal all filtered comments (shown dimmed with a left border accent). Click again to re-hide.

1. Clone or download this repository
2. Install dependencies and build:

   npm install
   npm run build

3. Open Chrome and navigate to chrome://extensions
4. Enable Developer mode (toggle in the top right)
5. Click Load unpacked and select the dist/ folder
6. Navigate to any post on BF — the extension activates automatically on /posts/* pages

Click the extension icon in the Chrome toolbar to open settings:

1. Enable the AI-powered (Claude) checkbox in the popup
2. Paste your Anthropic API key (sk-ant-...)
3. The extension uses Claude Haiku 4.5 — fast and cheap (~$0.001 per batch of comments)

AI results are cached in sessionStorage so revisiting a thread doesn't re-classify comments. The cache clears when you close the tab.

# Watch mode — rebuilds on file changes
npm run dev

# Production build
npm run build

The built extension is output to dist/. After rebuilding, go to chrome://extensions and click the reload button on the BF Filter card.

src/
  content.ts          — Entry point, 3-phase filter pipeline, DOM wiring
  popup.html          — Settings UI
  popup.ts            — Popup logic, reads/writes settings
  styles.css          — Summary bar and revealed-comment styles
  types.ts            — Shared TypeScript interfaces
  manifest.json       — Chrome extension manifest (V3)
  filters/
    keyword-filter.ts — Pattern/keyword matching (~80 phrases + regex)
    length-filter.ts  — Character minimum threshold
    ai-filter.ts      — Batched Claude API classification + session cache
    types.ts          — FilterStrategy interface
  dom/
    observer.ts       — MutationObserver for dynamically loaded comments
    manipulator.ts    — Hide/reveal DOM operations + summary bar
  storage/
    settings.ts       — Typed chrome.storage.sync wrapper

Edit src/filters/keyword-filter.ts:

• Exact matches — Add to the EXACT_FLUFF set (case-insensitive, punctuation-stripped)
• Regex patterns — Add to the FLUFF_PATTERNS array

Rebuild after changes.

• All keyword/length filtering runs locally in your browser. No data leaves your machine.
• AI filtering (when enabled) sends comment text to the Anthropic API. Your API key is stored in chrome.storage.sync (synced across your Chrome devices). No data is collected or stored by this extension beyond what's needed for classification caching in your browser's sessionStorage.

MIT — see LICENSE.