Cleaning up cache in Manifest v3

[sb8244]

I was looking through the code for how chrome.alarms is used, and I see there's a check for if (!isBackgroundPage()). This will return in the case of manifest v3, and the alarms and cleanup will not happen.

[fregante]

PR welcome to replace it with isBackground

[sb8244]

Thank you!

[sb8244]

@fregante Is it possible to cut a release, or is there a way to cleanly use this in a pre-release state?

[fregante]

I’m computer-less at the moment so I won’t be able to release it this week. For now you might be able to run npm install fregante/webext-storage-cache and hope that npm builds it from GitHub.