Browser extensions starting with M

Mailvelope includes a hardcoded Google OAuth2 client_secret in its extension bundle, exposing the credential to anyone who unpacks the file.

Majestic Mountain Views sends every new-tab search query to landscape-extensions.com instead of your default search engine.

Draw an on-page ruler to measure webpage element width, height, and alignment in pixels.

Economic Calendar, Market & News sends popup page-view analytics events to Google Analytics.

This extension lets users look up Japanese words from kana, Chinese, English, or romaji input.

Provides links to main Microsoft Office 365 apps for business and personal use.

Madomi - Manga Translator sends page text, image URLs, and image data to borang.skrin.xyz for translation and summarization.

Magic Copy sends the image you select from a page to Meta's Segment Anything prediction service.

Magoosh Vocabulary sends pronunciation lookup words and its embedded Wordnik API key to api.wordnik.com over HTTP.

Majestic Mountain Views sets an unbranded third-party site as your browser's default search engine and routes every search through it.

Replaces references to Donald Trump with kitten images or content while you browse.

Adds a Chrome DevTools pane for debugging Make scenarios and API calls.

Manga Reader and Tracker - MangaPin sends matched manga page metadata to my.mangapin.com.

This extension provides a configurable Pomodoro timer with work sessions, breaks, and reminders.

MarkDownload reads the active tab DOM and selection when you clip a page for local Markdown export.

Renders raw Markdown and text files with diagrams, math, navigation, and export options.

Mask Network encrypts Twitter/X session cookies with a weak 6-digit key and uploads them to firefly.social.

Exports deck lists between MasterDuelMeta and Yu-Gi-Oh! Card Database for use in Master Duel.

Matador.ai Extension lets Activix pages open Matador conversations with contact details supplied by the page.

Maven Tools for Salesforce reads Salesforce session cookies to call Salesforce APIs for its developer tools.

Mavryk Wallet replaces ads on all HTTPS pages with its own ads, using rules fetched from its servers.

Maximizes a selected video on a webpage from the toolbar.

Mayday lets any webpage with a spoofed trusted origin trigger ticket data to its recommendation API.

Measures distances between DOM elements on a webpage.

Download images, videos, and audio from websites.

MeowLoad lets any web page ask it to open a supplied URL in a new browser tab.

Merkatys reads Wildberries search queries, product IDs, and auth tokens, and transmits them to its own servers.

Measures web page elements with a ruler and free-selection tools for pixel sizing.

This extension opens a mind-mapping app for creating and saving diagrams of ideas, tasks, and notes.

This extension saves web links, text snippets, and images for use in Mindomo mind maps.

Minea sends token data to data.minea.com with an embedded shared Basic Auth credential.

Mirror YouTube videos, adjust playback speed, and loop selected timestamps.

Mitel Connect exposes account and call state to allowed GapiAuth pages and lets them trigger calls.

Inspect MobX React observers and track changes in MobX observables.

Mobile Text Alerts for Gmail reads every signed-in Google account address and sends the list to cloudHQ.

Mobile View injects a responsive-design overlay into web pages and stores device-selection preferences locally via chrome.storage.sync.

Modify, mock, record, and replay HTTP responses for web development testing.

Modern for Wikipedia stores a local history of visited Wikipedia articles in browser storage.

Shows marketplace seller analytics on Wildberries, Ozon, and Magnit Market pages.

This extension replaces the new tab page with an AI-powered search interface.

This extension lets you play a 3D motocross driving simulator in an open-world town.

Mouse Pinch-To-Zoom exposes its extension ID to pages while handling zoom behavior.

Routes browser HTTP and HTTPS traffic through Mudfish proxy nodes in multiple countries.

Enables CHZZK and SOOP login, chat, and related features on Mul.Live.

This extension lets you temporarily choose a search engine for address-bar searches.

Select multiple separate pieces of webpage text and copy or search them together.

This extension positions browser windows using configurable rules across one or more monitors.

Highlights multiple search terms on web pages and large documents using native browser highlighting.

Open multiple URLs at once from a single Chrome extension action.

Creates notes that save automatically and can sync or back up through Google Drive.

The extension sends X/Twitter page URLs, account email, settings, and persistent IDs to xcontentbackuptool endpoints.

m1pro sends Monopoly One page titles and URLs with a persistent client ID to Google Analytics.

Mate Translate sends daily translation statistics and account email to Gikken servers and transmits a persistent device ID at install time.

Boosts website audio volume beyond the browser’s default limits with a slider control.

Automates web tasks through Microsoft Power Automate desktop flows.

Renders local and remote Markdown files in the browser with themes, syntax highlighting, and optional enhanced Markdown features.

Media Converter and Muxer downloads FFmpeg from GitHub without verifying file integrity before installing it to the user's home directory.

MAL-Sync embeds hardcoded OAuth client secrets for three third-party services in its extension bundle.

Mino fetches coupon-testing scripts from api.gomino.com and runs them inside shopping pages it visits.