consider the following commandline options of chromium

[anarcat]

http://peter.sh/experiments/chromium-command-line-switches/#apps-checkout-url

those could be an interesting addition to https://github.com/gorhill/httpswitchboard/wiki/Privacy-matters:-Hidden-remote-connections

--apps-checkout-url ⊗ Overrides the apps checkout URL, which is used to determine when to expose some private APIs. ↪
--apps-gallery-download-url ⊗ The URL that the webstore APIs download extensions from. Note: the URL must contain one '%s' for the extension ID. ↪
--apps-gallery-update-url ⊗   The update url used by gallery/webstore extensions. ↪
--apps-gallery-url ⊗  The URL to use for the gallery link in the app launcher. ↪

also:

http://peter.sh/experiments/chromium-command-line-switches/#check-for-update-interval
http://peter.sh/experiments/chromium-command-line-switches/#disable-component-update
http://peter.sh/experiments/chromium-command-line-switches/#extensions-update-frequency
http://peter.sh/experiments/chromium-command-line-switches/#safebrowsing-disable-auto-update