Kindle .active_content_sandbox

[JJTech]

I've recently noticed the .active_content_sandbox folder on my kindle. This puzzled me, because according to the internet, all active content had been disabled before my kindle even came out (it's a 2019 edition).

I did some preliminary experiments, and it appears to contain several caches and databases related to the built in apps (experimental browser, store, help, etc.). They were mostly .localstorage files, which turned out to be regular sqlite dbs that contain the settings and history for the apps. Interestingly, I was able to replace the cached storefront.html, and display my own page in place of the store. There were also some additional apis available on window.kindle, which I would like to experiment with.

Has anyone else experimented with this? Do you think this could be used to develop anything interesting (i.e. a jailbreak or similar)? Or at least (a) custom app?

[JJTech]

Just putting this here so that it gets more notice, I managed to use the aforementioned active_content_sandbox to change the Kindle browser's orientation (without jailbreaking).

Originally Posted by JJTech

This is a very simple process, and does not require you to jailbreak your Kindle.
Note that this process has only been tested on the KT4.

1. Download SQLite Browser.
2. Open SQLite browser and select "Open Database" on the top ribbon.
3. Navigate to the .active_content_sandbox/browser/resource/LocalStorage/ folder on your Kindle. Select file__0.localstorage. Note that you may have to select "All files (*)" in the file type drop-down.
4. When the database opens, select the "Browse Data" tab.
5. In the table, click on the value column in the "settings" row. (It should hold JSON containing the browser settings). It will open on the right. Modify the "orientation" key, replacing it with the desired orientation. (Possible values: 'auto', 'portrait', 'portraitUp', 'portraitDown', 'landscape', 'landscapeLeft', 'landscapeRight')
6. Click the apply button below the edit box.
7. Click "Write Changes" on the top ribbon.

You're done! The changes should take effect next time you open the browser.

[Eures]

Tested on PW4, great! The browser menu (three dots) is now in the center because it must have set an absolute margin somewhere.

[Eures]

I wonder if you could add a text wrapping instruction there as well, like there was in the Kindle Keyboard, I'm looking into the Kindle Keyboard's file system to see if I can find it...

[JJTech]

I don't have a Kindle Keyboard, so I'm afraid I won't be much help.