localStorage limit in Chrome extension

Question

I have a couple of questions on use of localStorage in Chrome extensions.

Is the 5mb storage limit per extension?
Does Chrome use the extension ID to monitor whether an extension conforms to this limit?

Possible duplicate of http://stackoverflow.com/questions/5302212/is-there-any-way-a-google-chrome-extension-can-increase-local-storage-space — Benjamin Gruenbaum, Jul 13 '13 at 00:14
Doesn't mention what Chrome uses to monitor whether an extension conforms to the limit. — Chromer, Jul 13 '13 at 00:19

score 3 · Accepted Answer · answered Jul 13 '13 at 08:36

In short: Yes and Yes.

localStorage is tied to an origin ^{w3 spec: The localStorage attribute}, usually the protocol and host part of a resource's URL.

The origin of a Chrome extension is chrome-extension://EXTENSIONIDHERE, which implies that the extensionID of a Chrome extension is indeed used to enforce the per-origin storage limits.

You can find a proof of this by visiting your profile directory, and looking in the Default/Local Storage directory, which contains several (SQLite) files of the following format:

chrome-extension_EXTENSIONIDHERE_0.localstorage
chrome-extension_EXTENSIONIDHERE_0.localstorage-journal

score 1 · Answer 2 · answered Jul 13 '13 at 04:23

1

Extension's localStorage is similar to website's localStorage so I guess it'd be 5mb. You can also consider using chrome.storage
Extension id is the only unique thing to every extension so chrome must use this to conform to this limit.

answered Jul 13 '13 at 04:23

Uzair Farooq

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localStorage limit in Chrome extension

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