Browser extensions starting with C

Copies web pages in Markdown, HTML, or custom JavaScript-defined formats.

Checks text and background color contrast against WCAG guidelines.

CookieBlock loads a GitHub known-cookie list that can affect how it classifies and removes cookies.

Copies selected browser tabs to the clipboard in formats such as Markdown or HTML.

Custom Style Script injects user-configured JavaScript or remote script URLs into pages that match saved rules.

Automatically opens mapped websites in selected Firefox containers.

Manages passwords by autofilling logins, saving credentials, and generating random passwords in the browser.

Converts audio or video files to MP3 from a drag-and-drop interface.

Remove unwanted page elements temporarily or permanently while browsing websites.

Adds PHP application runtime metrics and debugging details to the browser’s developer tools.

Manage Ğ1 account status, payments, and free currency network information in your browser.

CR-Unblocker routes non-static Crunchyroll browsing requests through a bundled community SOCKS proxy.

Bulk deletes ChatGPT conversations from the ChatGPT website.

This extension blocks ads on YouTube pages for a cleaner viewing experience.

CardPointers X sends Bank of America SAMLResponse and RelayState values to ui-api.tripleup.dev during deals setup.

Clears cookies for the website open in the current tab without affecting other sites.

This extension changes the browser’s reported timezone to a selected value.

Adds a convenient “Close Tabs to the Right” item to the Firefox tab context menu.

Contextual Google Image Search sends selected images or image URLs to Google for reverse-image searches.

CapturePage captures the current page when you click it and can include the page URL or title in the saved filename.

This extension corrects file Content-Type and Content-Disposition headers for page and download requests.

Capture visible areas or full web pages and save screenshots as image or PDF files.

Send chat messages with Ctrl+Enter on supported AI chat sites.

Adds custom cursor features to Firefox.

Generates and validates XPath, CSS, linkText, and partialLinkText selectors in browser developer tools.

Chatterino Native Host sends Twitch channel names and chat layout details to the local Chatterino app.

Chatslator sends supported livestream chat messages to Google Translate for automatic translation.

Shows cat content on chosen websites to prompt breaks from distracting browsing.

Sets a custom http or https page to appear when opening a new tab.

Quickly enable or disable global browser cookies from a visible toolbar button.

Adds library, search, customization, and chat management tools for AI chatbot sites.

Reloads a page’s CSS without reloading the entire page.

Conversion Plus sends Google search terms and persistent extension identifiers to conversionp.azurewebsites.net after consent.

Changes the case of selected text in input and textarea fields from the context menu.

Keyboard shortcuts close other tabs, tabs to the left, or tabs to the right of the current tab.

Copy On Select automatically copies selected text from HTTP and HTTPS pages to the system clipboard.

Capital Koala sends login credentials to its API with the password embedded in the request URL.

Circle reader sends account tokens and synced reading data to circlereader.com over cleartext HTTP.

Shows open Firefox tabs in a sidebar grouped by privacy container.

Select multiple checkboxes on a page and check, uncheck, or invert them with one click.

Copies page and link URLs to the clipboard in multiple markup and text formats.

Clearly Reader sends the current page URL to trk.lesslab.net when you create or remove highlights.

CPH Submit polls a local companion app and submits saved source code to programming contest sites.

Content Farm Terminator exposes a web-accessible sandbox that makes credentialed fetches to caller-supplied URLs.

This extension lets Firefox cache bookmark favicons when sites send no-store instructions.

CouponCabin Sidekick sends merchant page URLs, coupon codes, and order totals to CouponCabin when applying coupons.

Blocks known cryptocurrency mining sites and in-page mining scripts while you browse.

Monitors the clipboard in an enabled tab and inserts new clipboard contents into the page.

Cross Domain - CORS rewrites response headers so non-credentialed cross-origin reads are broadly allowed.

This extension can access all websites, browser tabs, and browser storage.

CF-Predictor sends Codeforces contest IDs and contestant handles to cf-predictor.wasylf.xyz.

C2PA Content Credentials sends resized page images to Digimarc SBR when watermark checking is enabled.

C3C FBState Utility reads Facebook authentication cookies into fbstate JSON and can replace them from imported files.

CANVO - Advanced Image Editor opens an install page that embeds a remote HTTP iframe from canv3app.chrome-app-ext.online.

Generates fake credit card test data for development and form validation workflows.

CCBrowser by Noves sends a bundled Noves API auth secret with Canton API requests.

CF FetchCodes imports Google Fonts when it injects its Codeforces problem-page stylesheet.

CFCA CertEnrollment SMB Extension lets approved Suning Bank pages relay requests to a local native messaging host.

CFCA CertEnrollment.ESUNBank Extension lets approved ESUN Bank pages connect to and message local native apps.

This extension helps users update expired certificates stored on a USB key.