Browser extensions starting with C

CS2 Trader scrapes Steam API keys and access tokens from Steam pages on install and sends item inspection data to its developer backend.

C2 Password reads form credentials on all sites, auto-fills stored logins, and disables Chrome's built-in password saving.

CFCA CertEnrollment.SRCB Extension bridges SRCB bank pages to locally installed native messaging hosts without validating the host name.

Enables CFCA U-key certificate authentication for Bank of Beijing personal online banking.

CFCA CryptoKit.SRCBSCF Extension bridges CFCA-affiliated banking pages to a local native messaging host for cryptographic operations.

CFCA WebSeal.SRCB Extension bridges bank web pages to local native security software via native messaging, accepting the target host name from the calling page without validation.

Switch between open tabs in most-recently-used order with keyboard shortcuts.

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

This extension lets users test their clicks per second with multiple timed click-speed tests.

Checks CSS and XPath selectors and highlights the matching page elements.

This extension opens CSV files in the browser and displays them as organized tables.

Adds NICE CXone contact center tools to CRM workflows for managing customer interactions.

Adds labeled color categories and custom palettes to Google Calendar events.

Cambridge Dictionary Lookup sends selected text to Cambridge Dictionary when you choose its lookup menu item.

CaptchaMaster sends page screenshots and captcha images to a solver app running on your own computer.

Captions for Live Presentations sends user IP address, geolocation, and speech transcripts to third-party servers.

Cars Lightning Speed sends your leaderboard nickname and score over cleartext HTTP to a Disney highscores server.

Cats Fan sends new-tab search queries to cats.catsfanext.com with an affiliate tracking ID.

This extension occasionally shows a John Cena video after a page loads and you interact with it.

This extension lets you change your mouse cursor to a custom choice.

Change Timezone (Time Shift) accepts timezone-override commands from any page, with no check on who sent them.

Organizes Google Gemini chats into folders with search, shortcuts, and conversation-copying tools.

Automates batch prompt submission and result downloads on chatgpt.com.

ChatGPT Delete All Chats computes a persistent browser fingerprint on chatgpt.com and sends it to antonkhoteev.com on every API call.

Copies LaTeX from ChatGPT math expressions with a single click.

ChatGPT For Chrome sends search-result queries to OpenAI to generate its sidebar answers.

ChatGPT Optimizer sends user-selected page text to ChatGPT and user-entered URLs to productivity.rocks.

This extension lets you access ChatGPT from a popup, the address bar, and the right-click menu.

ChatGPT for Gmail sends your Gmail account email, timezone, and selected draft text to Salesgear AI endpoints.

Adds ChatGPT-style chat, summarization, and selection tools across web pages and search results.

Chatslator sends Kick, Twitch, and YouTube live chat text to Google Translate for real-time translation.

Chatterino+ keeps a WebSocket to its own servers and sends your Twitch login ticket and chatter names for badge lookups.

Chatwork Quick Info Input injects Google Fonts into ChatWork pages, sending referrer and IP metadata to Google.

CheaperThere sends selected flight and hotel itinerary details from supported booking sites to its pricing API.

Chess Helper (chess.com) sends Chess.com board positions to stockfish.online for move recommendations.

Opens Lichess analysis for finished games from Chess.com and other chess sites.

Opens the current page or a link in Choosy’s browser prompt from Chrome.

Chrome Audio Capture records the active tab's audio after a popup request and saves the recording locally.

Adds a companion cat that appears on websites while you browse.

Shows counts for open tabs, open windows, and tab usage stats in the extensions bar.

Checks Qualis journal classifications by ISSN in Chrome.

Turns web pages into a cleaner reading mode with extracted text and customizable layout options.

Creates citations for competitive debate documents and supports quick cite editing and copying.

City Scapes sets your browser's default search engine to landscape-extensions.com, an unbranded third-party search proxy.

ClassroomGo embeds a hardcoded YOURLS API signature in its bundle, allowing any party with source access to create short URLs on gtogo.to.

Classwork Zoom can upload Google Classroom and Drive API responses when server-controlled logging is enabled.

Claude Fable 5 Limit & Usage Tracker - ClaudeKarma sends daily health counters, version, OS, and language to TokenKarma.

Claude QoL lets scripts on Claude pages read its stored text-to-speech provider API key through a postMessage settings bridge.

Claude Tuner sends snapshot submissions to its backend using a shared fallback API key.

Claude Usage Meter reads Claude.ai organization and usage-limit data to show local usage status.

Clean-Spam-Link-Tweet can send selected X/Twitter post text and account metadata to a developer report server.

This extension opens online videos in a compact Picture-in-Picture window from the toolbar or video player controls.

Clipboard Tool polls the clipboard every second and stores copied text in local extension storage.

Generate and autofill unique identities, passwords, phone numbers, emails, and payment info in website forms.

Quickly closes open browser tabs from the toolbar, keyboard shortcut, or context menu.

Closes duplicate browser tabs with a toolbar button.

Cloud VPN sends the first page URL visited on each host to vpnincloud.com before the VPN connects.

Color Picker loads HTML from linangdata.com on every popup open and inserts it into the popup page.

Pick colors and view their HEX, RGB, hue, saturation, and value details.

Adds grading-table formatting and spreadsheet-copy tools to Séneca evaluation pages.