Is there a way to command Chrome or Firefox to execute JavaScript or load a Bookmarklet directly from the command line?

Is there a way to execute javascript in the current browser window through the command line, either in Chrome or Firefox? Or is it possible to load a bookmarklet that includes javascript?

I'm interested in creating a program that can monitor changes in a CSS file, and once the file is updated, automatically load the new CSS file in the browser window. I've created a javascript bookmarklet for this purpose, but I would like it to happen automatically every time the CSS file gets updated.

Answer №1

For Firefox users, executing JavaScript code in the current tab without an extension is not possible, unlike in Chrome where it may be feasible. The command line feature can open a javascript: URL, however, the code will run in a separate tab and won't have access to the existing page. To achieve this functionality in Firefox, an extension would need to implement the nsICommandLineHandler interface (refer to https://developer.mozilla.org/en/Chrome/Command_Line for guidance) and handle specific command line flags. Subsequently, it would utilize

nsIWindowWatcher.getMostRecentWindow("navigator:browser")
to retrieve the current browser window and execute
window.gBrowser.contentWindow.location.href = "javascript:..."
to run the bookmarklet on the active tab.

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