Extension Coder
Build an extension
← All posts

30 Chrome Extension Ideas Worth Building in 2026

Most Chrome extensions solve a specific frustration. The best ones are narrow, do one thing well, and aren't already in the browser by default. Here are 30 ideas organized by category, with a note on build complexity for each.

Simple = mostly a content script and some CSS/JS, a few hours of work. Medium = needs background logic, storage, or multiple pages. Bigger = meaningful backend or complex API integration.

Productivity

  1. Tab title renamer: rename any browser tab to a custom label. Simple.
  2. Focus mode tab limiter: close or hide tabs beyond a set number, restorable later. Medium.
  3. Reading list with read time: save pages to a list with estimated read time based on word count. Simple.
  4. Pomodoro timer in the toolbar: countdown visible in the extension icon badge, plays a sound when done. Simple.
  5. Auto-archive old tabs: move tabs older than N days to a browsable archive panel. Medium.
  6. Keyboard shortcut cheatsheet overlay: press a hotkey to see the keyboard shortcuts for the current site. Medium.

Developer tools

  1. JSON response prettifier: format raw JSON responses in the browser window with collapsible trees. Simple.
  2. Color picker from any page: pick a pixel color on any page and copy the hex. Simple.
  3. CSS unit converter overlay: hover over an element to see its computed styles with px/rem/em toggles. Medium.
  4. Favicon downloader: one click to download the favicon of the current site in multiple sizes. Simple.
  5. HTTP header inspector: show response headers for the current page in a clean popup. Medium.
  6. Localhost switcher: quickly switch between localhost port numbers you use for local dev. Simple.

Shopping

  1. Price history on product pages: pull price history from a public API and show a small chart on Amazon, Best Buy, etc. Bigger.
  2. Coupon auto-tester: on checkout pages, try a list of known coupon codes and apply the best one. Bigger.
  3. Wishlist price drop notifier: monitor saved product URLs and alert when the price drops below a threshold. Bigger.
  4. Unit price calculator: calculate and display price-per-unit on grocery or bulk product pages. Simple.
  5. Cart total in local currency: convert shopping cart totals to your home currency in real time. Medium.

Content and social

  1. Twitter/X word replacer: replace certain words or phrases with custom text sitewide. Simple.
  2. Hide algorithmic content: hide the "For You" feed on Twitter/X and show only Following. Simple.
  3. LinkedIn connection message templates: one-click fill of pre-written connection note templates. Simple.
  4. YouTube timestamp notes: attach text notes to specific timestamps in a video, saved locally. Medium.
  5. Reddit thread summarizer: summarize long Reddit threads using an AI API call. Bigger.
  6. Comment hider by keyword: hide comments on any site containing configurable keywords. Simple.

Accessibility

  1. Font size override: force a minimum font size on all pages, configurable per site. Simple.
  2. High contrast mode toggle: apply a CSS high-contrast filter with one click, with per-site memory. Simple.
  3. Reading ruler: highlight the line your cursor is near to help with tracking while reading. Simple.
  4. Dyslexia-friendly font injector: replace page fonts with OpenDyslexic or a similar alternative. Simple.

Niche and specific-use

  1. Jira ticket quick-create: highlight text on any page and open a pre-filled Jira ticket form. Bigger.
  2. GitHub PR reviewer roulette: on a GitHub PR page, pick a random reviewer from the repo's contributor list. Medium.
  3. Meeting link collector: scan all open tabs for Zoom, Meet, and Teams URLs and show them in one popup. Simple.

A few patterns worth noting: ideas 1, 4, 7, 10, 16, 18, 19, 24, 25, 26, and 27 are genuinely a few dozen lines of JavaScript and CSS. You could ship one in a day. Ideas 13, 14, 15, 22, and 28 need backend infrastructure or reliable third-party APIs, which is where scope tends to expand.

If you have an idea from this list (or your own), Extension Coder lets you describe it in plain English and builds the extension for you.

Build it without the setup.

Describe the extension you want and Extension Coder builds it, previews it live, and helps you publish.

Start building