On Debian 13 with GNOME, if you want Chromium to open a new tab with a local webpage (or a page that does not require an internet connection) instead of https://duckduckgo.com, you can adjust Chromium's startup behavior.

Method 1: Change Startup Page in Chromium Settings

1. Open Chromium.

2. Go to:

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   chrome://settings/onStartup

3. Under "On startup," select:

   • "Open the New Tab page" (if you want a blank page or a local HTML file)
   • "Open a specific page or set of pages" and enter the local file path (e.g., file:///path/to/your/local_page.html)

   If you want a blank page, use:

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   chrome://newtab

   or simply about:blank in the address bar.

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Method 2: Edit Chromium Preferences File

If you want to enforce this change system-wide or for all profiles, you can edit Chromium's preferences file:

1. Close Chromium.

2. Open the preferences file:

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   nano ~/.config/chromium/Default/Preferences

   (Replace ~/.config/chromium/ with the correct path if you use a different profile or Chromium variant.)

3. Search for:

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   "homepage": "https://duckduckgo.com",
   "startup_urls": ["https://duckduckgo.com"],

   and replace them with:

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   "homepage": "about:blank",
   "startup_urls": ["about:blank"],

   or your local file path (e.g., "file:///path/to/your/local_page.html").

4. Save the file and restart Chromium.

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Method 3: Use Command Line Arguments

You can also launch Chromium with a command-line argument to open a specific page:

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chromium --new-window "about:blank"

or

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chromium --new-window "file:///path/to/your/local_page.html"

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Notes:

• If you want to open a local HTML file, ensure the file path is correct and accessible.
• If Chromium resets these settings after updates, consider using a policy or extension to enforce the change.

Would you like help creating a local HTML file for testing? Or do you want to enforce this setting system-wide?