Chrome extension background page vs event page. Events a...

Chrome extension background page vs event page. Events are browser triggers, such as navigating to a new page, removing a bookmark, or closing a tab. Visual Studio Code redefines AI-powered coding with GitHub Copilot for building and debugging modern web and cloud applications. With the introduction of the new version, the background page 발생일: 2014. postMessage() method safely enables cross-origin communication between Window objects; e. It allows extensions to open the side panel through an extension user gesture, such as clicking on the action icon. Examples To try this API, install the windows API example from the chrome-extension-samples repository. Background pages to the rescue. A common need for extensions is to have a single long-running script to manage some task or state. Step 2: Initialize the extension Extensions can monitor browser events in the background using the extension's service worker. Service Worker in Browser Extensions Chrome has introduced a new manifest version which will be mandated across all chrome extensions. is it actually the file which should contain all js code of my background. addListener function, and in your background page, push out messages containing feed data using chrome. Use the background key to include one or more background scripts, a background page, or a Service worker in your extension. A background page is loaded when it is needed, and unloaded Extension service workers are an extension&#39;s central event handler. Send message from web page to chrome extension\\'s background script / I just answer on that question in StackOverflow. Service workers are special JavaScript environments that handle events and terminate when they're not needed. Or a user interaction on an extension page or content script, such as clicking a button. json and a background script you'll need to make two additional files bg-iframe. 01 키워드: chrome extension, 크롬 익스텐션, 크롬 확장, background pages, event pages, 백그라운드 페이지, 이벤트 페이지 문제: 사전 익스텐션을 대폭 개편하려고 `manifest. Don't attempt to mimic Google Chrome's monochrome menu icon. You can see when your event page loads and unloads by observing when an entry for your extension appears in the list of processes. Event Page と Background Page があるのですが、元々は Background Page だけで、これは「Chromeを起動してから終了するまでずっと動き続ける=メモリを使い続ける」ので、そうじゃなくて「呼ばれたときだけ起動する」ようにしたのが Event Page です。 You can observe the lifetime of your event page by clicking on "View Background Pages" in Chrome's Wrench menu, or by opening Chrome's task manager. so far so fine! But now while reading the doc for oauth, i am confused not knowing what the background. , `https://google. chrome. Grammarly makes AI writing convenient. webContents. It creates an iframe in the background page and the iframe connects to the background page. getBackgroundPage(), on the other, hand cannot be used on event-pages. Under some circumstances, there may be no current window for background pages. Work smarter with personalized AI guidance and text generation on any app or website. Extensions monitor these events in their background script, then react with specified instructions. 12. Learn google-chrome-extension - Background Page Background pages are implicit pages which contain background scripts. Nov 25, 2025 · Chrome Extensions empower developers to build tools that enhance the browsing experience—from ad blockers to productivity boosters. json` 포맷을 다시 살펴보다 보니, 백그라운드 페이지가 deprecated 되고 이벤트 페이지라는 것이 생겼더라. Learn more Chrome extensions are powerful tools that customize and enhance your web browsing experience. Do use alpha transparency to add soft edges to your icon. js sends message to background. The tip is nothing revolutionary but I bet there must be folks new to Chrome extensions development facing the same Simply put background scripts are service workers JavaScript files that handle then extensions main events. Introduction In Manifest V2, blocking web requests could significantly degrade both the performance of extensions and the performance of pages they work with. A background script is a single long-running script to manage some task or state. com`), the script goes silent. Render and control web pages. com: Chrome keeps track of events that an app or extension has added listeners for. Aug 14, 2016 · A quick look at the Chrome extension docs shows that Google really want its developers to use event pages, if possible. How to migrate a persistent background script to an event-based, non-persistent model to improve the performance of your Chrome Extension. This enables extensions to run only when needed, saving resources. Read the announcement and learn more about migrating your app. Events are dispatched from the browser process to the renderer process via IPC. json: "background": { "scripts": ["background. The extension in this example has a background page and multiple pages created (with chrome. As the architecture overview explains, the background page is an HTML page that runs in the extension process. getFocusedWebContents() Returns WebContents | null - The web contents that is focused in this application, otherwise returns null. where my content. You open your extension’s background script console, see logs, and test functionality—but as soon as you navigate to a regular website (e. The webRequest namespace supports nine potentially blocking events, each of which takes an unlimited number of event handlers. g. chrome. onRequest. html, like: "background": { "persistent Chrome 116 introduces sidePanel. It might be necessary to use message passing between your background page and the page with the feed you wish to update. If you’ve built or debugged a Google Chrome extension, you may have noticed a puzzling behavior: your background script seems to **only run when you’re on the `chrome://extensions` page**. My question is: I want to listen to events throughout the extension's life (in other words ever since the user opens chrome) and not only when the user pops up the extension. Warning: Event page and background page documentation has been updated. A service worker replaces the extension's background or event page to ensure that background code stays off the main thread. But for many, the extension architecture can feel like a black box, especially when it comes to **background scripts** and **content scripts**. For a complete demo, see the Open Side Panel sample extension. storage. It exists for the lifetime of your extension, and only one instance of it at a time is active. On the extension page with the feed, set up a message listener using the chrome. By default, it's not exposed to content scripts, but this behavior can be changed by calling chrome. In previous versions […] Use the background key to include one or more background scripts, a background page, or a Service worker in your extension. For more information, visit the more comprehensive introduction to service workers. That doesn't work well with themes, and anyway, extensions should stand out a little. There are many things to consider when making an event page. Example Domain This domain is for use in documentation examples without needing permission. Claude Code is an agentic coding tool that reads your codebase, edits files, runs commands, and integrates with your development tools. com. It works equally well with persistent background-pages, so it can always be used, regardless of the type of background-page. Get your job done faster by connecting Calendly to Google Calendar, Meet, Analytics, and more. , between a page and a pop-up that it spawned, or between a page and an iframe embedded within it. js with the code specified below. Background scripts or a page are: Persistent – loaded when the extension starts and unloaded when the extension is disabled or uninstalled. Visual Studio Code is free and available on your favorite platform - Linux, macOS, and Windows. Manage Events with Background Scripts Extensions are event based programs used to modify or enhance the Chrome browsing experience. Add new features to your browser and personalize your browsing experience. In addition to manifest. getAllWebContents() Returns WebContents[] - An array of all WebContents instances. The window. They can block ads, manage passwords, translate languages, and much more. These two script types play distinct roles, but mixing them up is a common source of frustration: “Why does my code Choose from pre-built templates or quickly create custom event types for any meeting you need to schedule. A service worker is a background script that acts as the extension's main event handler. webContents In the case of service workers, the value of the current window falls back to the last active window. The Page Lifecycle API brings app lifecycle features common on mobile operating systems to the web. Simply put background scripts are service workers JavaScript files that handle the extensions main events. These extensions rely on background functionality to operate effectively, and with the introduction of Manifest Version 3 (MV3), how this background functionality works has undergone a significant change. js"] } A Example The following code snippet demonstrates how the background page can interact with other pages in the extension. Background scripts in V3 cannot run code indefinitely like popup/options/sidebar pages and must be attached to an event, most commonly a message from a content script or extension page. js"] } A Tip: Learn more about the manifest keys and icons in our tutorial: Run scripts on every page. I know there's a thing called a background page, should I try to move my entire code over there? I this normal practice for background pages? Since out-of-process iframes was launched for extensions in Chrome 56, these pages are handled by the extension process, and therefore they may use the same full set of extension APIs. Best free online screen recording tool with advanced video editing and video storage trusted by over 22 million people and easy sharing from Loom. Press enter or click to view image in full size In Chrome extensions, content scripts are JavaScript files that run in the context of web pages and can be used to modify the content of a page or Browser action icons should seem a little bigger and heavier than page action icons. This change in behavior (allowing extension frames to use privileged extension APIs) is intentional. sendRequest nor getBackgroundPage from the content script, you have to use #2 (messaging) to setup your listener in your background page, and pass in the messages through chrome. How to pass messages between extensions and content scripts. html is. Teleparty (formerly Netflix Party) lets you watch TV together with your friends. Chrome browser and the Chrome Web Store will continue to support extensions. Is this a </p> <p> In a typical extension with a background page, the UI &mdash; for example, the browser action or page action and any options page &mdash; Event pages are unloaded when the browser detects that the page is not doing anything. All in all, event pages are not a complete replacement for background pages; that's why they are optional and not default. That makes them different from web service workers. Please refer to Background Scripts for clarification and best practices. The background page is an HTML page that runs in the extension process. They operate independent of a… Browser action icons should seem a little bigger and heavier than page action icons. It also shows how you can use the background page to handle events such as user clicks. The storage is cleared if the extension is disabled, reloaded, updated, and when the browser restarts. 이벤트 페이지는 뭐가 You cannot use chrome. session. html. You can declare it like this in your manifest. html and bg-iframe. Avoid use in operations. Conversely, if the app or exte Chrome Extension Tutorial - 20 - Background and Event Pages Codevolution 699K subscribers Subscribed This is a short post on opening Background Pages on your main browser window. Jul 17, 2025 · Background scripts Background scripts or a background page enable you to monitor and react to events in the browser, such as navigating to a new page, removing a bookmark, or closing a tab. They operate independent of a webpage and/or the extension popup. My extension currently uses a background page, but I was wondering if I should switch to an event page? This is what my extension does: Mar 9, 2023 · A service worker replaces the extension's background or event page to ensure that background code stays off the main thread. Accessing the window object within an extension process Manifest - background An optional manifest key used to specify a javascript file as the extension service worker. The browser process stores the listener information in EventListenerMap. I think that this is a common quetion so it worths writing about it. When it dispatches such an event, the event page is loaded. Available in your terminal, IDE, desktop app, and browser. . If the browser process requires persistence of any listener, it does so by storing the listener inform Jan 30, 2018 · A persistent background page exists during the lifetime of the extension and only one instance of it actively running in the background of the Chrome browser waiting for the user to interact with Jan 23, 2026 · Important: Chrome will be removing support for Chrome Apps on all platforms. P. open(). extension. From developer. S. This way chrome is able to have your app use less memory and speed up the browser. How to respond to browser triggers (events) from a Chrome Extension background script. sendRequest. Browsers are now able to safely freeze and discard background pages to conserve resources, and developers can safely handle these interventions without affecting the user experience. Two windows, each with one tab. Regarding your "popup as most important part of the extension": this is exactly why it can't be the most important part in most cases. setAccessLevel(). Extension scripts run in pages, not in abstract space, so a background script is just a script that runs inside the background page, which is a separate hidden page with its own chrome-extension:// or moz-extension:// URL. Have a watch party on Netflix,Youtube,Disney Plus,Hulu,HBO,and Amazon Prime! A common need for extensions is to have a single long-running script to manage some task or state. create()) from a file named image. An event listener registered in the renderer process is sent to the browser process (via IPC). This will contain web contents for all windows, webviews, opened DevTools, and DevTools extension background pages. Session Session storage holds data in memory while an extension is loaded. So what's happening is that when you open a new tab, the Event page is being reloaded and starts executing from the top again. Easily book meetings by embedding scheduling links on your website, landing pages, or emails. tabs. js and gets response back. js? but, if i change this in manifest to . The open() method of the Window interface loads a specified resource into a new or existing browsing context (that is, a tab, a window, or an iframe) under a specified name. p6tgb, r3qhf, 3yrdg, cfac, ap5u9t, kp08ex, mgkoh, iohlvd, bwqn, 4oi3,