Browser extensions starting with C

CFCA CertEnrollment bridges ADBC bank pages to a local native application for certificate-based authentication.

CFCA CryptoKit.ADBC bridges pages on adbc.com.cn and hellotech.top to a locally installed bank PKI/certificate app via native messaging.

This extension shows a calendar clock with local time.

Adds a dark mode appearance to Canvas pages on instructure.com domains.

This extension reports a random fake canvas fingerprint when websites check canvas data.

Capturables exposes a persistent install identifier to every visited page.

ChatGPT LightSession intercepts ChatGPT API responses in the browser and trims conversation history to a configurable number of recent messages.

Chatwork Input Tools adds formatting buttons and UI tweaks to the Chatwork chat interface, operating entirely within the browser.

This extension records audio from websites, computer audio, or voice and exports recordings as WEBM files.

Chromegle sends Omegleweb video-chat peer IP addresses to geo.eulerstream.com for geolocation.

Removes popups and content restrictions on supported job review websites in the browser.

Replaces the new tab page with a blank page or custom background.

CoffeTab replaces your new-tab page with a meta-refresh that immediately redirects every new tab to coffetab.com.

Collibra Browser Extension connects to a configured Collibra instance and sends search activity and login events to Pendo.io analytics.

Convert Picture to Text runs Tesseract OCR locally in the browser, fetching language model files from an external CDN when processing images.

Converter for Excel uploads user-selected Excel files to api.pdfconverted.com for PDF conversion.

Play a browser clicker game where cookie clicks earn upgrades and ongoing cookie production.

Copies titles and URLs from open tabs to the clipboard in selectable formats.

Copy Youtube Transcript sends YouTube transcript text and your chat prompt to cyt.hamzaw.com.

CyberGhost Cookie Cleaner sends domains shown in its exceptions UI to Google's favicon service.

Manage browser cookies by viewing, editing, creating, deleting, backing up, restoring, and searching them.

Clears selected browsing data from the Firefox toolbar.

This extension can access browser cookies and download cookie data from sites you visit.

Shows updated CCTV or webcam images from saved camera URLs when the toolbar button is clicked.

CFCA CryptoKit accepts a caller-supplied native host name from bank-domain pages and connects to it without validating it against an allowlist.

This extension uses CFCA certificates to help perform message encryption and decryption.

This extension provides a browser-based multi-currency wallet for cross-chain DeFi use.

CSDN browser assistant adds a clip button to every website and reports your CSDN account cookies and page views to CSDN's tracking servers.

CXone Agent Noise Cancellation provides audio noise cancellation for NICE CXone contact-center agents and exposes no external data collection.

Adds buttons for saving and switching Google Calendar visibility presets.

Place calls through Cisco Jabber directly from the browser.

Hides selected Twitter interface items to create a calmer browsing experience.

Adds keyboard caret navigation to web pages with the F7 key.

Replaces the new tab page with a customizable dashboard of widgets and sidebar tools.

Converts assistant replies from Simplified Chinese to Taiwan Traditional Chinese with visual correction cues.

ChemDraw Web Clipboard bridges clipboard requests from any webpage to a local native messaging host on the user's machine.

ChinaHelper silently redirects ordinary AliExpress product page visits through an affiliate link carrying the developer's own tracking IDs.

Checks websites and provides real-time security warnings while you browse.

Chrome Dino Game [Offline] runs the classic Chrome dinosaur game in a browser popup with no network access.

This extension opens a classic dungeon game from the Chrome toolbar.

Replaces YouTube thumbnails with video frames and can adjust video title styling.

Adds browser access to Clockwork PHP application runtime metrics for development and debugging.

Pick a color from a browser page and copy its hex code to the clipboard.

This extension compares foreground and background colour contrast against WCAG level 2 guidance.

Compresses PDF files online to reduce their file size for uploads, email attachments, or archiving.

Blocks access to content farm sites to help avoid opening them by mistake.

Searches specific content sites from the browser address bar using @ commands.

Shows a customizable clock in the browser toolbar with notifications and time tools.

Copy Cookies reads every cookie for the active tab, including httpOnly ones, and copies them to your clipboard on click.

Copy selected page content, links, images, and tab lists as Markdown to the clipboard.

Coursology sends selected text and tab screenshots to its AI API and stores user-uploaded files publicly on Vercel Blob storage.

CrapApi Http Test syncs your saved API requests, including headers and credentials, to its backend over unencrypted HTTP.

Opens new Google Docs, Sheets, Slides, Forms, or Drive from a browser menu.

Save, highlight, clip, and annotate webpage content for reading and note-taking.

Converts highlighted prices and amounts into multiple currencies using current or saved exchange rates.

Blocks or masks browser APIs that websites can use for fingerprinting.

Customizes YouTube by hiding ads, recommendations, Shorts, comments, and other page elements.

CyberGhost VPN Free Proxy bundles a hardcoded shared API key that is sent to its backend on every request.