# mozilla/fathom

DEPRECATED - A framework for extracting meaning from web pages

Repository: https://github.com/mozilla/fathom
Canonical: https://ross.abutalabs.com/products/mozilla-fathom
Homepage: http://mozilla.github.io/fathom/
Language: JavaScript
License: MPL-2.0
License Family: copyleft
Topics: abandoned, unmaintained
Archived: true
Last push: 2025-11-18T23:58:10+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 52, release rhythm 35, longevity 100
- inputs: {"age_days": 3820, "days_push": 288, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1963, forks 73 (observed 2026-08-28T04:05:59.665784+00:00)

## What it is
Fathom is a supervised-learning framework for recognizing and classifying parts of web pages, tagging DOM nodes with types and probabilities using a Prolog-like rule language and a neural-net-based trainer. It is now deprecated and unmaintained.

## Use cases
- detect pop-ups on web pages
- extract address forms from html
- classify web pages by type
- label a corpus of web pages for training
- recognize login and password forms
- extract structured meaning from dom nodes

## When to choose
- you need rule-based plus trained semantic extraction from DOM trees
- you want to label and train on a corpus of labeled web pages
- you need probabilistic tagging of page elements like forms or pop-ups

## When to avoid
- you need an actively maintained project
- you want general web scraping without a training workflow
- you need production-grade support or timely bug fixes

## Facets
- artifact type: framework
- maturity: abandoned
- function: machine-learning, web-scraping, parser, browser-extension
- domain: machine-learning, web-development
- platform: browser, browser-extension
- tags: supervised-learning, dom-extraction, prolog-like-rules, deprecated, web-page-classification, fathomfox, natural-language-processing, javascript, nodejs

## Member repositories
- mozilla/fathom (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:59.665784+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:05:33.386423+00:00, confidence not recorded.
  - readme: https://github.com/mozilla/fathom (fetched 2026-08-28T04:05:59.665784+00:00, sha 790df4d38cf4)
  - homepage: http://mozilla.github.io/fathom/ (fetched 2026-08-29T10:45:44.852528+00:00, sha 6d37f2f390a0)
- Data as of 2026-08-30T08:39:29.467469+00:00.