Browser extensions starting with C

Copies selected text, links, images, tabs, and bookmarks as Markdown.

This extension provides currency conversion in Firefox.

Enables YouTube’s TV interface in the browser for casting from a phone or tablet.

Choose older YouTube layouts from 2008 through 2021 with a single click.

Chesscheat reads chess.com board positions and overlays Stockfish best-move highlights during games.

Copilot Sidebar removes Microsoft Copilot frame-protection headers so Copilot can load inside its Firefox sidebar.

Adds rating-change and performance columns to Codeforces contest ranklists.

ChartFox Browser Extension lets ChartFox pages read responses from non-ChartFox XHR requests.

Copy ShortURL sends the page, link, or image URL you choose to a configured URL-shortening service.

Copies the titles and addresses of open tabs into a clipboard-ready link list.

Generates citations for websites in MLA, AMA, APA, BibTeX, and Wikipedia formats.

Adds a quick save button and hotkeys for downloading images and videos under the cursor.

ChatGPTBox sends selected text and extracted page content to the user's configured AI provider.

Provides a simple offline calculator for basic arithmetic in the browser.

Chess.com analyse at lichess sends a selected Chess.com game's PGN to lichess.org when the user starts analysis.

This extension has no provided description or listed permissions.

Cleanplaats Marktplaats filter stores marketplace listing IDs you view in local extension storage.

Adds solved-problem statistics and unsolved-attempt counts to Codeforces profile pages.

Highlights and hides spam-link tweets and other filtered posts on X/Twitter.

Adds user-written custom CSS styles to webpages and lets you toggle them on or off.

CDA.pl Auto Downloader PRO sends issue reports with video page and stream URLs to a Discord webhook.

CFCA CertEnrollment.IBK Extension lets IBK web pages connect to a caller-specified native messaging host.

CFCA CertEnrollment.YOCYL Extension lets allowlisted websites choose a native messaging host and relay messages through it.

CFCA CryptoKit.Induschain Extension lets allowed websites send selected payloads to a local native-messaging host.

CFCA CryptoKit.Midea V3 Extension lets scoped Midea-related sites send requests to local CFCA native messaging hosts.

CFCA CryptoKit.NCB Extension lets approved NCB web origins choose a native messaging host and forward payloads to it.

CFCA CryptoKit.YOCYL Extension lets many allowed websites choose and message a native application.

Removes risk warnings and pop-up alerts on CNFans for a cleaner shopping experience.

This extension formats user-entered text into CO-STAR prompt templates for ChatGPT.

CS2 Float Checker ships a static SteamLedger API token used for its backend extension endpoints.

CS2 Profile Stats sends viewed Steam profile IDs to CS2 statistics services to show player stats.

CSS Variables Editor collects CSS variables and page CSS-variable config from active tabs into session storage.

Watch multiple CHZZK live broadcasts at the same time in a browser multiview.

Disables browser cache for requests from selected hostnames.

Quickly opens search for the Cadence Learning and Support Portal.

Calculator Extension sends searches typed on its new-tab page to brownmile.com.

Adds planning, charting, and event-management tools to a calendar interface.

Replaces the new tab page with rotating Call of Duty wallpapers and quick-access widgets.

Adds click-to-dial calling for phone numbers shown on webpages in Chrome.

Adds a floating desktop webcam widget with resizing, pinning, fullscreen, and photo capture controls.

Controls camera pan, tilt, and zoom on video conferencing websites.

Shows your webcam video as a picture-in-picture overlay on top of other windows.

Records video presentations and adds virtual camera effects for video calls.

Batch creates and downloads Canva designs from CSV-based template variables.

Hides Canva Pro thumbnails, badges, watermarks, and premium suggestions for a cleaner Canva interface.

Adds a quick Student View link to supported Canvas LMS pages.

Canvas Quiz Solver sends Canvas quiz question text, options, and images to its backend when users request an answer.

Edit direct video files in the browser by trimming clips, adding text overlays, and downloading MP4 exports.

Captures web pages as images and lets you add text or freehand notes.

Capture Full Page Screenshot captures user-requested page screenshots and stores them in extension-local storage.

Capture by Tracker stores Tracker login credentials in reversible base64 and reuses them for Tracker API requests.

Capybara Live Wallpaper loads Google Fonts and sends user-added shortcut domains to Google's favicon service.

This extension offers a car parking game with precision driving challenges and multiplayer competition.

Earns cashback on purchases from CashClub partner online stores.

Copies or searches the current Castle Learning question in a few clicks.

Cat wallpaper sends precise location coordinates to OpenWeatherMap for its new-tab weather widget.

Cesium sends the stored wallet public key to configured ES peers while checking for unread notifications.

Blocks YouTube videos and channel elements based on a user-defined channel list.

Counts characters, words, sentences, and paragraphs in text for quick writing analysis.