edgecase extension

codeforces + leetcode bookmarks [chrome extension]

A lightweight chrome extension that lets you bookmark LeetCode + Codeforces problems directly from the problem page, then manage them in a clean popup UI with status, tags, company chips, and reminders.

what it does

bookmark problems : Codeforces + LeetCode

• works on:
  • leetcode.com/problems/...
  • codeforces.com/problemset/problem/... and codeforces.com/contest/.../problem/...
• saves:
  • title, url, site
  • LeetCode: slug + difficulty
  • Codeforces: contestId/index + rating

features

• one click bookmark button on:
  • leetcode problem pages (/problems/...)
  • codeforces problem statements
• tags (comma separated) + filtering
• status tracking:
• Unsolved / Revise / Solved / Didn’t understand
• optional custom status
• company tags for LeetCode problems (offline mapping)
• “Remind me in” (1/3/7/14 days) stored per bookmark
• search across title / tags / companies / site / status
• uses chrome.storage.local (no accounts, no backend)

who is this for

• programmers doing LeetCode + Codeforces
• students preparing for interviews
• people tired of scattered bookmarks / notion pages

typical workflow

1. open a problem on leetcode or codeforces
2. click the blue ➕ bookmark icon
3. add tags / status / reminder
4. later, open the popup to filter by:
   • company
   • status (Revise / Unsolved / custom too!)
   • tags

how it works

• content.js injects a small bookmark icon into leetcode/codeforces pages.
• when clicked, it scrapes problem metadata (title, difficulty/status/tags, rating, etc.) and stores a record in chrome.storage.local.
• popup.html + popup.js renders bookmarks and provides an edit modal to update tags/status/reminders.
• company data is loaded from a local companies_map.json built from a public dataset.
• source for companies dataset is public as per 2025 november

screenshot - the blue plus icon is for adding it to popup!

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install (local / dev)

1. clone this repo
2. open chrome:
   • chrome: chrome://extensions
3. enable developer mode
4. click load unpacked
5. select the extension folder (the one containing manifest.json)

how companies mapping works

this repo includes:

• scripts/build_companies_map.mjs it generates companies_map.json
• the extension reads companies_map.json at runtime, no API calls

dataset used

company list comes from a public repo: snehasishroy/leetcode-companywise-interview-questions

i don’t ship their repo data inside this project. i keep it locally and generate the json.

if you want to regenerate mapping locally:

1. clone dataset repo into data/companywise/ (ignored by git)
2. run:
   • node scripts/build_companies_map.mjs
3. it generates:
   • companies_map.json

privacy

• everything is stored locally in chrome (chrome.storage.local)
• no account, no tracking, no analytics
• no external api calls required for normal usage

why i built this?

• i kept bookmarking in random places for leetcode and codeforces
• some days in leetcode, some days in a doc, sometimes notion and sometimes even a notebook.
• it came to a point where it became a mess!
• when it came to revsion or keeping track, i had no clue what i had even solved or missed out on :(
• so i made this bookmark
• this is present in all problem pages of leetcode and codeforces
• and with one press it gets added in bookmarks
• along with tags and reminders
• and for leetcode it even presents company -> got through public dataset see more in credits
• so when preparing for interviews and test it filters out easily and i don't need to search or make new roadmaps daily!

project structure

Starter Files/
  content.js        # injects bookmark icon + scraping
  popup.html        # ui
  popup.js          # list/search/edit/save logic
  popup.css         # styling
  manifest.json
scripts/
  build_companies_map.mjs
companies_map.json  # generated

license

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limitations / known edgecases

• leetcode is a spa, so the conentent script re-run mounts using MutationObserver
• ui changes may change or break some selectors
• reminders currently stores timestamp, doesn't trigger OS notifications yet

credits

• source for dataset : snehasishroy/leetcode-companywise-interview-questions
• not affiliated with dataset author. this project only uses it to build an offline companies map

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built by Manya Kalra

• if you liked it or it helped you make sure to give it a star!
• feel free to reach out for any bugs/enhancements