![]() ![]() However, if you need to terminate the background page, you can do so in about:debugging.įor example, the notify-link-clicks-i18n example extension logs a message from its background script when it receives a message from one of its content scripts. When you debug a non-persistent background script, the background script won't go idle while the toolbox is open. Note that the console shows all errors raised by the browser, not just errors related to your extension's code. To get started, open your background script in Sources.Īs you run your extension, the Console displays logged output, including calls to console.log() made by the extension's background scripts and any errors the browser raises as it executes these scripts. To debug background scripts, use the Toolbox Debugger in the split console view so you can view the Console below Debugger. Non-persistent background scripts are recommended because they consume less of the browser's resources.īackground scripts are loaded inside an invisible background page: by default, this is an empty HTML document, but you can specify a custom page and define it as the background page using the manifest.json background key. In contrast, non-persistent background scripts load when needed to respond to an event and unloaded when they become idle. Persistent background scripts remain loaded for the lifetime of the extension. These scripts can be persistent or non-persistent. This example is in the webextensions-examples repository.īackground scripts enable an extension to monitor and react to events in the browser, such as navigating to a new page, removing a bookmark, or closing a tab. We use the notify-link-clicks-i18n extension example to illustrate the debugging features relevant to background scripts. It occasionally contains more detailed information about errors reported to your extension. This console contains messages from the whole browser, including your and other extensions. Log messages not associated with an extension script, such as the stderr output of the nativeMessaging APIĬan only be viewed via the Browser Console. Log messages from content scripts can be viewed in the developer tools of the tab where the content script runs instead of about:debugging, see: The Developer tools toolbox at about:debugging shows log messages from extension scripts. Log messages can usually be viewed via the Console of the context where the script runs. with the Console API or by triggering (uncaught) errors. Your extension can generate log messages, e.g. You can now drag the toolbox tab to a separate window, so you can place it alongside the window where you're executing the extension. You do this using the split console, press esc to activate this mode. There is an overview of all relevant places to look for messages at Viewing log output.įor much of the debugging work, it's useful to be able to view Console with Inspector or Debugger. ![]() This console shows messages from your background script and extension pages other logs may appear elsewhere. Storage to view details of data stored by the extension.Debugger to set breakpoints and watchpoints in your extension's JavaScript, and examine and modify the extension's state.It also provides a command line, where you can execute JavaScript in the extension's context. Console to view messages logged by the extension and error messages logged by the browser as it runs the extension.Inspector to examine and modify the HTML and CSS used to build your extension's pages.in the left-hand menu, click This Firefox (or This Nightly).Ī new tab opens showing Inspector in the Toolbox.You use an implementation of the developer tools called Toolbox to debug extensions. Removing your extension from distribution.Will I ever be able to sell through AMO?.Use plain language in any privacy policy or license agreement.Select the right platforms and versions.The add-on description can be longer, but not too long.Focus on key features in your screenshots.Make sure your summary is just long enough. ![]()
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