Ubuntu – How to open Chromium in incognito mode by default

To disable incognito on chrome/chromium you need to edit the policies. Doing this will prevent you from opening an incognito window via Ctrl+Shift+n, and will also grey out the incognito window option in the options tab in the corner.

If you're using chrome, create the folder /etc/opt/chrome/policies/managed. Or if you're using chromium, create the folder /etc/chromium/policies/managed.

Then create a file in that directory named test_policy.json. It can have any name you want, but it needs the extension to be .json.

Open it in your favorite editor and put:

{
    "IncognitoModeAvailability": 1
}

That should do it!

Source: http://www.chromium.org/administrators/linux-quick-start and http://www.chromium.org/administrators/policy-list-3

Close the browser and edit /home/user/.config/chromium/Default/Preferences. There will be a section in regards to window_placement.

For a resolution of 1920x1080 for example:

...

"window_placement": {
   "bottom": 1080,
   "left": 0,
   "maximized": true,
   "right": 1920,
   "top": 0,
   "work_area_bottom": 1080,
   "work_area_left": 0,
   "work_area_right": 1920,
   "work_area_top": 0
}

...

I could never find a way specify this at start-up and it can change if you open new browser windows.