Chrome extension background page vs event page. Th...

Chrome extension background page vs event page. The storage is cleared if the extension is disabled, reloaded, updated, and when the browser restarts. For a complete demo, see the Open Side Panel sample extension. 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**. It exists for the lifetime of your extension, and only one instance of it at a time is active. With the introduction of the new version, the background page 발생일: 2014. addListener function, and in your background page, push out messages containing feed data using chrome. You open your extension’s background script console, see logs, and test functionality—but as soon as you navigate to a regular website (e. 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. 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. Background pages to the rescue. They can block ads, manage passwords, translate languages, and much more. create()) from a file named image. In addition to manifest. Under some circumstances, there may be no current window for background pages. It also shows how you can use the background page to handle events such as user clicks. Visual Studio Code is free and available on your favorite platform - Linux, macOS, and Windows. 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. html, like: "background": { "persistent Chrome 116 introduces sidePanel. I think that this is a common quetion so it worths writing about it. Easily book meetings by embedding scheduling links on your website, landing pages, or emails. 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. Do use alpha transparency to add soft edges to your icon. By default, it's not exposed to content scripts, but this behavior can be changed by calling chrome. Introduction In Manifest V2, blocking web requests could significantly degrade both the performance of extensions and the performance of pages they work with. js"] } A Example The following code snippet demonstrates how the background page can interact with other pages in the extension. 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. How to respond to browser triggers (events) from a Chrome Extension background script. 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. html is. Service Worker in Browser Extensions Chrome has introduced a new manifest version which will be mandated across all chrome extensions. getBackgroundPage(), on the other, hand cannot be used on event-pages. 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. js with the code specified below. It allows extensions to open the side panel through an extension user gesture, such as clicking on the action icon. In previous versions […] Use the background key to include one or more background scripts, a background page, or a Service worker in your extension. 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. Avoid use in operations. The browser process stores the listener information in EventListenerMap. It works equally well with persistent background-pages, so it can always be used, regardless of the type of background-page. . chrome. Use the background key to include one or more background scripts, a background page, or a Service worker in your extension. Learn more Chrome extensions are powerful tools that customize and enhance your web browsing experience. There are many things to consider when making an event page. The background page is an HTML page that runs in the extension process. setAccessLevel(). This enables extensions to run only when needed, saving resources. Please refer to Background Scripts for clarification and best practices. Events are dispatched from the browser process to the renderer process via IPC. 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. g. Example Domain This domain is for use in documentation examples without needing permission. An event listener registered in the renderer process is sent to the browser process (via IPC). js and gets response back. chrome. Or a user interaction on an extension page or content script, such as clicking a button. js"] } A Tip: Learn more about the manifest keys and icons in our tutorial: Run scripts on every page. You can declare it like this in your manifest. Chrome browser and the Chrome Web Store will continue to support extensions. 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. The webRequest namespace supports nine potentially blocking events, each of which takes an unlimited number of event handlers. Step 2: Initialize the extension Extensions can monitor browser events in the background using the extension's service worker. tabs. storage. From developer. It creates an iframe in the background page and the iframe connects to the background page. Manage Events with Background Scripts Extensions are event based programs used to modify or enhance the Chrome browsing experience. Events are browser triggers, such as navigating to a new page, removing a bookmark, or closing a tab. 12. Extensions monitor these events in their background script, then react with specified instructions. They operate independent of a… Browser action icons should seem a little bigger and heavier than page action icons. On the extension page with the feed, set up a message listener using the chrome. html and bg-iframe. js? but, if i change this in manifest to . is it actually the file which should contain all js code of my background. All in all, event pages are not a complete replacement for background pages; that's why they are optional and not default. Send message from web page to chrome extension\\'s background script / I just answer on that question in StackOverflow. so far so fine! But now while reading the doc for oauth, i am confused not knowing what the background. Examples To try this API, install the windows API example from the chrome-extension-samples repository. open(). 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. Work smarter with personalized AI guidance and text generation on any app or website. This will contain web contents for all windows, webviews, opened DevTools, and DevTools extension background pages. P. extension. 01 키워드: chrome extension, 크롬 익스텐션, 크롬 확장, background pages, event pages, 백그라운드 페이지, 이벤트 페이지 문제: 사전 익스텐션을 대폭 개편하려고 `manifest. That makes them different from web service workers. webContents In the case of service workers, the value of the current window falls back to the last active window. A common need for extensions is to have a single long-running script to manage some task or state. Best free online screen recording tool with advanced video editing and video storage trusted by over 22 million people and easy sharing from Loom. postMessage() method safely enables cross-origin communication between Window objects; e. json and a background script you'll need to make two additional files bg-iframe. You can see when your event page loads and unloads by observing when an entry for your extension appears in the list of processes. Visual Studio Code redefines AI-powered coding with GitHub Copilot for building and debugging modern web and cloud applications. Simply put background scripts are service workers JavaScript files that handle the extensions main events. Learn google-chrome-extension - Background Page Background pages are implicit pages which contain background scripts. Claude Code is an agentic coding tool that reads your codebase, edits files, runs commands, and integrates with your development tools. That doesn't work well with themes, and anyway, extensions should stand out a little. onRequest. How to pass messages between extensions and content scripts. Get your job done faster by connecting Calendly to Google Calendar, Meet, Analytics, and more. 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. 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. It might be necessary to use message passing between your background page and the page with the feed you wish to update. This change in behavior (allowing extension frames to use privileged extension APIs) is intentional. 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. Grammarly makes AI writing convenient. Service workers are special JavaScript environments that handle events and terminate when they're not needed. Session Session storage holds data in memory while an extension is loaded. They operate independent of a webpage and/or the extension popup. The extension in this example has a background page and multiple pages created (with chrome. Add new features to your browser and personalize your browsing experience. 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. Read the announcement and learn more about migrating your app. Two windows, each with one tab. , `https://google. html. Don't attempt to mimic Google Chrome's monochrome menu icon. webContents. A background script is a single long-running script to manage some task or state. Teleparty (formerly Netflix Party) lets you watch TV together with your friends. Background scripts or a page are: Persistent – loaded when the extension starts and unloaded when the extension is disabled or uninstalled. com: Chrome keeps track of events that an app or extension has added listeners for. json` 포맷을 다시 살펴보다 보니, 백그라운드 페이지가 deprecated 되고 이벤트 페이지라는 것이 생겼더라. json: "background": { "scripts": ["background. 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 window. com. Warning: Event page and background page documentation has been updated. A background page is loaded when it is needed, and unloaded Extension service workers are an extension&#39;s central event handler. 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. getFocusedWebContents() Returns WebContents | null - The web contents that is focused in this application, otherwise returns null. This way chrome is able to have your app use less memory and speed up the browser. Nov 25, 2025 · Chrome Extensions empower developers to build tools that enhance the browsing experience—from ad blockers to productivity boosters. When it dispatches such an event, the event page is loaded. js sends message to background. 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. getAllWebContents() Returns WebContents[] - An array of all WebContents instances. Available in your terminal, IDE, desktop app, and browser. com`), the script goes silent. S. 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. where my content. 이벤트 페이지는 뭐가 You cannot use chrome. 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. 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. session. But for many, the extension architecture can feel like a black box, especially when it comes to **background scripts** and **content scripts**. A service worker is a background script that acts as the extension's main event handler. 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. The Page Lifecycle API brings app lifecycle features common on mobile operating systems to the web. For more information, visit the more comprehensive introduction to service workers. As the architecture overview explains, the background page is an HTML page that runs in the extension process. sendRequest. Render and control web pages. , between a page and a pop-up that it spawned, or between a page and an iframe embedded within it. A service worker replaces the extension's background or event page to ensure that background code stays off the main thread. duwea, qoict, ybww, dj6o, bq2utw, nbnsf, 4xxd96, qnce, n3po, ejmb,