IndexedDB content from extension suddenly deleted

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Milden Jungs

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Mar 17, 2025, 10:13:16 AMMar 17

to Chromium Extensions

Hi, I am developing a Chrome extension which saves data in IndexedDB. Today I noticed that the whole data was removed from IndexedDB and it was emtpy. I did not delete the cache or removed the extension. What happened? This also applies to other users of my extension.

woxxom

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Mar 17, 2025, 6:12:51 PMMar 17

to Chromium Extensions, Milden Jungs

Some known reasons:

a mistake in the code
a bug in the browser
an external tool like CCleaner
no free space on the drive
disk failure

Juraj M.

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Mar 18, 2025, 2:56:25 AMMar 18

to Chromium Extensions, woxxom, Milden Jungs

You can add "unlimitedStorage" to your manifest file to prevent eviction:

https://github.com/w3c/webextensions/issues/388#issuecomment-1764578444

But yeah, the implementation is a bit buggy and data may still disappear for a various reasons listed above :)

Milden Jungs

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Mar 18, 2025, 5:17:54 AMMar 18

to Chromium Extensions, Juraj M., woxxom, Milden Jungs

Thanks for your responses. I added the "unlimitedStorage" permission to my manifest (together with the "storage" permission") but when I check with navigator.storage.estimate(), I can see that the quota stays the same (12165714186) and it does not appear to be unlimited. I also checked the properties of my IndexedDB database in dev tools and I saw that "Is persistent" is set to "No" (see screenshot). Is this the issue? How can I change that?

woxxom

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Mar 18, 2025, 9:19:40 PMMar 18

to Chromium Extensions, Milden Jungs, Juraj M., woxxom

It's always like that for extensions.

Milden Jungs

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Mar 19, 2025, 11:24:30 AMMar 19

to Chromium Extensions, woxxom, Milden Jungs, Juraj M.

Okay, nice to hear. Does that mean there is no way to actually check if the "unlimitedStorage" permission works?

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