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How to delete the url of local startpage, how to make it as a new tab?

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To make the local startpage as a new tab I tried autoconfig.js and autoconfig.cfg but I got a error message when I open the broswer and nothing change. To remove the url from the local startpage I browse the reddit but I couldn't find answer, I want that when I open the browser it show my custom and local startpage without the url appearing.

To make the local startpage as a new tab I tried autoconfig.js and autoconfig.cfg but I got a error message when I open the broswer and nothing change. To remove the url from the local startpage I browse the reddit but I couldn't find answer, I want that when I open the browser it show my custom and local startpage without the url appearing.

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If you get an error when you use autoconfig, then you can check the Browser Console for more detail.

What code are you using in autoconfig.cfg ?

Note that you need to set general.config.sandbox_enabled to false in autoconfig.js to be able you include JavaScript. You also can no longer import Services.jsm, but have to use a different way.

let Services = globalThis.Services || ChromeUtils.import("resource://gre/modules/Services.jsm").Services;

You can use the autoconfig.cfg file in the Firefox installation folder to initialize (set/lock) preferences and run privileged JavaScript code.

To use Autoconfig, place two files into the Firefox installation directory.

  • on Windows, they go into the same directory where Firefox is installed
  • on macOS, they go into the Contents/Resources directory of the Firefox.app

The autoconfig.js file that specifies to use autoconfig.cfg is placed into the "defaults\pref" directory where the channel-prefs.js file is located. The autoconfig.cfg file is placed at the top level of the Firefox directory.

  • autoconfig.cfg and autoconfig.js need to start with a comment line (//)
  • autoconfig.js needs to use Unix line endings (LF instead of CR/LF)

See also:


Content of autoconfig.js:

//start autoconfig.js with a comment line
pref("general.config.filename", "autoconfig.cfg");
pref("general.config.obscure_value", 0);
pref("general.config.sandbox_enabled", false);

Content of autoconfig.cfg: // start autoconfig.cfg with a comment line

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