Developer Tools extensions

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

Automates browser and desktop tasks with visual recognition, OCR, and scripted commands.

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.

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

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.

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

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

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

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

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

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.

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

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

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.

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

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

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

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.

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

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

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

DNS Checker sends each visited site's resolved IP address to dnschecker.org during navigation.

GPT for Ecom fetches Etsy listing and shop pages from server-directed queues and uploads the page HTML to Alibaba OSS.

Maven Tools for Salesforce reads Salesforce session cookies to call Salesforce APIs for its developer tools.

Mobile View injects a responsive-design overlay into web pages and stores device-selection preferences locally via chrome.storage.sync.

Quick source viewer reads the current page URL, HTML, scripts, and CSS when you open its source viewer.

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

SnipCSS sends saved page snippets, including the source URL and selected HTML/CSS, to its backend.

XPath Tester reads matching page text into its side panel when you evaluate an XPath.

svg-grabber reads SVG markup and the source page title and URL after you click its toolbar button.

ARIA DevTools loads Google-hosted Fira Code web fonts into pages when you activate its overlay.

Allow CSP: Content-Security-Policy removes Content-Security-Policy headers from pages and frames when enabled.

AppstoreSpy for Play Store sends visible Google Play app IDs and locale to AppstoreSpy for analytics enrichment.

Best Proxy Switcher automatically disables other installed extensions that use proxy permissions.

Core Web Vitals Visualizer sends the active page URL or origin to the Google Chrome UX Report API after a user request.

Dimensions Inspect | Gridman sends support messages, email addresses, and page paths to Amplitude analytics.