Developer Tools extensions

CORS Unblock lets the enabled page read cross-origin XHR responses by rewriting CORS and security headers.

Toggle Odoo debug mode from the browser toolbar or keyboard shortcuts.

Records browser HTTP/S requests and user actions to create and run JMeter or Selenium test scripts.

Datalayer Checker reads page dataLayer events on visited sites and saves selected snapshots locally.

Downloads selected GitHub repository files or folders as a ZIP without downloading the whole project.

Adds Photoshop-style grid guides and a ruler for measuring distances on web pages.

Creates a clickable map of page headings, sections, and landmarks for easier navigation.

JSON Viewer renders URL values from JSON pages into link attributes without escaping the URL.

Displays JSON documents as an editable tree view in the browser.

Link Redirect Trace sends the current tab's redirect-chain URLs to LinkResearchTools for SEO metrics.

This extension lets you manage and switch between multiple proxy configurations from the browser.

SEO Pro Extension sends the current page URL to Google CrUX when you open its popup.

Shows Squarespace page IDs so you can copy them for use in your code.

Switches the browser user-agent string from a toolbar button.

Controls Chrome WebRTC privacy settings to help prevent WebRTC IP address exposure.

WordPress Theme Detector and Plugin Detector sends visited WordPress page URLs and site paths to Themesinfo.

This extension lets users manually set webpage character encoding when text appears garbled.

Identify font details from selected text on websites via the right-click menu.

Inspects dataLayer activity and Google Analytics hits on web pages for analytics testing.

Tests websites for SEO, page speed, and web security issues across many pages.

This extension emulates different device viewports to help test and present website layouts.

Screen Ruler exposes its stable extension ID in page-visible DOM markers when the ruler is activated.

This extension helps advertisers verify, debug, and troubleshoot Snap Pixel implementations.

Sourcegraph loads Google Fonts CSS when adding its interface to GitHub pages.

Inspect typography details on a webpage, including font, size, color, and contrast for selected text.

This extension sends HTTP and HTTPS REST API requests from a browser interface.

This extension adds Salesforce developer tools for inspecting metadata, managing data, running Apex, and working with APIs.

Send and manage REST API requests from the browser with saved favorites, history, and custom headers.

CatalyzeX sends page URLs, paper titles, and arxiv IDs to its servers on every academic page visit, and links this activity to authenticated user accounts via Mixpanel.

AMP Validator fetches AMP pages in the background to validate them when you open or switch tabs.

Analyzes a website’s SEO elements and provides an SEO score.

Amplitude Event Explorer intercepts all outgoing browser requests to extract analytics payloads and can activate full DOM session recording on any page.

Fills web forms with random, realistic fake data for testing and data entry workflows.

Checks pages for robots, canonical, and link directives that affect crawling or indexing signals.

This extension visualizes and analyzes webpage tags using Tag Inspector’s tag library.

UI5 Inspector lets page scripts trigger injection of extension-packaged scripts into the active tab.

Adds repository and file size details plus per-file download tools to GitHub pages.

Adds configurable colored labels to websites so you can distinguish development, QA, staging, and production environments.

Shows current Ethereum fee information to help you assess blockchain congestion.

Measures webpage elements with draggable boxes, snapping, guides, and editable size overlays.

Chromium browser automation records user interactions including password field values and replays them by executing caller-supplied scripts in page context.

Clears selected browsing data from the browser toolbar.

Adds Ember.js debugging tools to Chrome Developer Tools for inspecting application structure and state.

Manages browser cookies with global search, editing, and import/export tools.

OWASP Penetration Testing Kit accepts page bridge messages that send saved DAST scan results to the configured PTK portal.

ObservePoint Debugger captures the URL, query string and POST body of requests on tabs you debug and sends them to ObservePoint.

This extension captures the current webpage for pixel-level zooming, measuring, and color picking.

This extension lets you open, edit, query, visualize, and export SQLite databases in the browser.

ScratchTools for Scratch sends enabled feature settings to its server and includes them in its uninstall URL.

Spector.js injects a global variable and wraps canvas APIs on every page visited, including before the user activates it.

Changes the JavaScript date, time, and optional time zone for the current tab.

30 Seconds of Knowledge sends page-view telemetry from its new tab and UI pages to Google Analytics with persistent IDs.

This extension audits the current webpage for SEO tags, indexing signals, links, images, headings, and structured metadata.

Manage Chrome cookies by searching, viewing, editing, deleting, saving, and restoring them.

Adds coding tools and customization options to the Google Apps Script editor.

Provides copy-and-paste Bubble.io components, layouts, landing page blocks, palettes, and form-building tools.

CORS Unblock rewrites CORS response headers across all sites when its unblock mode is enabled.