I still (unfortunately) am stuck with kiwi as well. I use it almost exclusively for a few webapps that use large amounts of indexeddb storage (>10gb) without a working export method[1]. With Firefox, I was able to export this data with devtools over ADB[2] to another Firefox install.

I really wish someone would create an indexeddb shim that interfaces with another system and only uses indexeddb for (very large) cache. Something I could drop in with a userscript would be lovely, even if it required running a local server with something like rsync or rclone responsible for the actual transfers.

[1]: dexie import export used to work, now it never returns. I have no way of verifying that it's doing nothing without putting it in background (thus suspending it...), but I've let it run 3 hours with no results. [2]: Firefox doesn't allow backing up app data for some reason but devtools functions allow reading and writing the profile directory through the use of terminal commands (zip profile directory, unzip and restart browser).