Browser extensions starting with J

JSON Formatter embeds a GiveFreely affiliate tracking library that monitors shopping browsing and sends search result URLs across all websites.

This extension adds calendar integrations for scheduling meet.jit.si video meetings.

Displays JSON responses in a formatted, validated view in Chrome.

Formats JSON and JSONP in Chrome with syntax highlighting and collapsible nodes.

Automatically finds cash back offers, promo codes, discounts, and price drops while you shop online.

Capture browser screenshots and recordings with technical context for bug reports and feedback.

Turns web articles into a customizable, distraction-reduced reader view.

JSON Viewer renders URL values from JSON pages into link attributes without escaping the URL.

Displays JSON documents as an editable tree view in the browser.

Formats JSON documents in the browser with highlighting and collapsible arrays and objects.

Jabra ChromeHost relays arbitrary web page messages to a native host controlling Jabra device state, without origin validation.

Save web pages and screenshots to Joplin while browsing.

Adds Jasper AI writing and editing tools inside common marketing and content platforms.

Blocks ads, popups, trackers, suspicious redirects, and unsafe sites while you browse.

Replaces YouTube thumbnails with images of Jambo and other cat-themed pictures.

JSON Formatter injects a content script into every page to detect and pretty-print raw JSON, and the current version contains no network or analytics code.

Looks up and translates Japanese words and selected sentences while you browse.

JetBrains Grazie Writing Companion sends text typed into web page fields to JetBrains' AI backend for grammar and completion suggestions.

Track work hours from the browser with clock in/out, timers, and task or project logging.

JustCall injects its content script into any page whose URL merely contains one of ~260 CRM domain names anywhere in the string.

JavaScript-Java Bridge relays messages between webpages and locally installed Java programs via native messaging, with no validation of which Java host a page may connect to.

Jabra Device Connector exposes a native messaging bridge to the Jabra SDK app that any web page can invoke without origin restrictions.

Join dispatches remote-control commands received via push notification through eval() with no signature check.

The javascript extension lets users store custom JavaScript per domain and injects it into every page on that domain on each navigation.

Joko transmits full merchant page URLs and shopping events with persistent user and device IDs to its servers and Amplitude.

JDM Cars Wallpaper New Tab sends new-tab search queries to tabssearch.com.

JSON Formatter sends the current JSON page URL to jsonlint.com when its JSONLint button is clicked.

JSON Formatter Pro reads JSON page contents and URLs to keep a local sidebar history.

JSON格式化工具 can capture the active tab as an EPUB and upload it to the configured reMarkable cloud API.

JSTorrent Helper extension sends selected magnet and torrent links, plus the current page URL, to the JSTorrent Chrome app.

JWT Inspector reads Authorization bearer JWTs in DevTools and displays their decoded contents locally.

JabRef Browser Extension fetches translator scripts from repo.zotero.org and executes them in active tabs without integrity checks.

JavaScript-Java Bridge connects web pages on user-allowlisted sites to locally-installed native messaging hosts via a postMessage relay.

Jazz-MIDI exposes a native MIDI host to any website via a CustomEvent bridge with no origin filtering.

Jira Product Discovery sends selected page text, screenshots, and page details to the Jira site you choose.

JoomPulse forwards intercepted Shopee marketplace API responses to joompulse.com.

JustAnswer sends the host and path of every page you visit to Google Analytics.

Japanese Dictionary JP creates ezse.net grade links containing transcript and grade-table data from student pages.

Joxi runs hotkey listeners on every website and uses Joxi token requests for sign-in and refresh flows.

Juicy Coupon sends supported shopping domains you visit to coupon-now.com for coupon lookup.

JSX Preview loads preview-engine libraries from esm.sh and can add Tailwind's CDN while rendering JSX.

JanitorAI Chat Downloader, Reader & Exporter captures JanitorAI chat responses so users can export them locally.

JunkFill fills forms on the active page with locally stored custom values when the user clicks its toolbar button.

JSON Formatter Pro loads Google-hosted fonts when its popup opens.

Jarvis sends the Chrome profile email address to Google Analytics during install and telemetry events.

Juicy - Amazon Coupons Finder sends Amazon search terms and coupon product listings to analytics and Juicy Discount servers.

1-2-3 Kupovina s Jeftinije.hr posts search queries, page URLs, and visible result metadata to jeftinije.hr.

JP English Dictionary sends hovered or selected page text to the configured translation provider.

Jiminny Sidekick sends selected phone numbers and CRM record identifiers to the Jiminny phone controller.

JobJump sends logged-in user IDs and partially masked emails with extension activity to Google Analytics.

JoggAI uploads the active page's full HTML and URL after you click Convert.

JokeTab injects a content script on every site that reports visited page URLs and shopping-domain activity to events.givefreely.com.

Jump To Recipe sends detected recipe-page URLs to jump-to-recipe-flask.onrender.com.

JD Data Scrapper Tool sends completed Justdial scrape results to www.scrappertool.com.

JKT48 Wrapped sends encrypted JKT48 account and ticket history to jkt48live.github.io for wrapped results.

Jace Gmail Extension sends a bundled bearer token to a Zeta Labs dev API when its popup polls thread data.

JavaScript Errors Notifier lets webpages request extension storage option values through its all-sites message bridge.

Jinno lets any website overwrite the extension account session through its page message bridge.