[compressedgas]

I looked this extension over and found that it had two issues:

It can lose data if you use it from more than one tab.

It uses local storage and so has a much lower limit on size of its block list and the information it can retain about what was blocked than if it used IndexedDB instead.

[Fudgel]

What do you mean by lose data?

[compressedgas]

When you load a page it makes a copy of the current block list in memory for that page and when another page updates the database it does so by writing the modified copy to the extension which stores it in the extension's local storage.

If an a page was loaded in the past, and you have since interacted with the extension via another tab, interacting with that page will revert the block list to what it was when that page was loaded. Losing the updates which have been done since.