Browser extensions starting with C

Copy Host loads a Google Fonts stylesheet from its popup when the extension is opened.

CopyClip reads clipboard text on all web pages and saves recent entries with page URLs in Chrome sync storage.

CopyCss embeds a Lemon Squeezy bearer token and sends license activation and validation requests to its API.

CopyPlus reads configured form fields from the active tab and writes them to the system clipboard.

Core Web Vitals history sends the active tab hostname to Rumvision when its popup loads.

Counter for Todoist sends popup and options page diagnostics to Sentry.

Coupon Clipper can send its embedded Albertsons API client secret to a crafted active tab URL.

Create New shares the active tab URL and page title with selected Google compose or calendar services.

Cristiano Ronaldo Clean Wallpaper sends custom shortcut URLs to Google's favicon service.

Cristiano Ronaldo Manchester United 2003-2009 Wallpaper fetches remote HTML for its new-tab page from Gameograf.

Crunchyroll Party sends watch-party URLs, chat, display names, and playback state to ws.primevideoparty.com.

CtrlTix Queue Handler imports cookie data from ticketing URLs into your browser before redirecting you.

Cuik SEO Extension sends audit URLs and Cuik account details to crawl.cuik.io when a user starts an SEO audit.

Cursor Magic adds a detectable extension-derived style tag to every HTTP and HTTPS page it runs on.

Custom Chrome Shortcut Manager sends shortcut URLs, searches, calculator expressions, and aliases to Google Analytics.

Custom Cursor Pro sends selected cursor image requests from visited pages to cdn.custom-cursors.com.

Custom Cursor for Chrome changes the cursor on every site and broadcasts its extension ID to pages.

Custom Cursors injects saved cursor styles into web pages using settings stored in the browser.

Custom Fields for Google Calendar records its extension panels and sends DOM, URL, page title, and form input events to tglens.tabgraf.com.

Custom JavaScript for Websites injects user-saved scripts, styles, and remote resources into matching site pages.

Custom Tab For Chrome sends new-tab geolocation coordinates to panel.onlynewtab.com for weather lookup.

Customized subtitles, works with Disney Plus loads Google Fonts stylesheets on Disney+ pages.

CvMax autofill sends page text and form fragments from matched sites to CvMax APIs.

Cy-Fi records user-started browser actions into Cypress test code stored in extension session storage.

Cyborg Tiger Live Wallpaper New Tab fetches remote popup HTML from api.gameograf.com and inserts it into its new-tab page.

CÔNG CỤ ĐẶT HÀNG FLASHWAY sends marketplace order details and a Lasership session token to lasership.net.

The extension sends selected product details from scoped Chinese shopping sites to Hangquangchau247's cart API.

Cong cu mua hang Buyvina.net sends product-page details and selected image-search files to Sabomall and ASA endpoints.

chatvideo sends Bilibili video IDs and extracted subtitle data to www.chatvideo.cc.

chess helper sends Lichess game IDs and entered FEN chess positions to a Google Cloud Run API for chess analysis.

clearspace sends feedback submissions with account details to a hardcoded Slack webhook.

click to call requests your public IP address to create a persistent uniqueId for its service.

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

COGext : System Monitor resolves your public IP address through api.ipify.org for its network dashboard.

This extension blocks suspicious patterns copied through the browser to help defend against phishing.

cat-catch records media request URLs, page details, and selected headers for media it detects on visited pages.

CGI US Visa Appointment Auto Rescheduler stores your portal password and security answers in plaintext via Google Chrome Sync.

CFCA CertEnrollment.JLBank Extension connects to a caller-chosen native messaging host and relays the caller's payload with no allowlist.

Ctool 程序开发常用工具 sends a beacon to its own server every time you open one of its dev tools, tagged with a persistent user ID.

Classi AI 학생 sends the student's browsing history, Gemini AI chat content, and live screen/camera to a teacher dashboard.

CNN U.S. inserts news feed content from notifiernews.com into its popup using unescaped HTML.

Generates AI comment suggestions for LinkedIn posts based on the user’s profile, tone, and settings.

Citrix Secure Access (Canary) periodically sends browsing history and device/user telemetry to a Citrix-controlled endpoint.

Click to component listens for window messages with no origin check, letting any page script redirect its next clicked-source URL.

Custom Aurora Background requests your precise geolocation and sends the coordinates to OpenWeatherMap on every new tab.

CG No Login Master runs its popup script on every website visited, sending the page's origin and the user's IP to its vendor's server.

CPR Enroll Agency Connect runs server-supplied automation steps on certification tabs, some via OS-level synthesized clicks.

CG Entry Master sends the user's email, access token, and IP address to its server in cleartext HTTP, embedded in the request URL.

Canvas-Wise reads every question and answer option on a Canvas quiz page and sends them to its own server to auto-fill answers.

Class Timer sends the active tab's hostname and your typed timer title to its own server whenever you start a timer.

Clean for LinkedIn hands its own web app your LinkedIn session cookie on request.

Provides access to CK-12’s free math, science, and other learning content.

This extension provides an offline calculator with standard, memory, and scientific functions.

Create web and print designs with templates, fonts, images, and photo editing tools.

This extension opens installed Chrome apps and provides quick access to the Chrome Web Store.

Records high-quality MP3 audio with playback controls and classroom-focused saving options.

This extension supports seating plans, behavior tracking, and Q&A assessment for classroom management.

Provides access to a personal cloud desktop for apps, files, and classes.

Provides access to ClassLink LaunchPad single sign-on learning resources for supported schools and organizations.