According to their github repo, it was last rebased with chromium version 105.0.5195.24, which was from August 2022. Using a 15 month old browser seems hilariously insecure.
I use Kiwi, I take the risk for the ability to run my own extensions (though I use a two-fisted approach where I use Chrome for deep accounts). It's a shame it's not updated more often, it's an open source project I would support.
Yes, but everyone else is vulnerable to not being able to run extensions.
As mentioned, I just use it for news & general web site surfing, no accounts.
Your user agent string or the actual browser code? The former is notoriously just set to whatever makes websites happy. An easy way to test is see if a current feature actually works as expected e.g. https://jsfiddle.net/fxc9a8uc/1 "test1" should be green at the top right.
It's also possible that they updated the code but didn't push the changes to the repo, which I guess is better than running 15 month old code, but also is kinda suspicious because they're not honoring their commitment to open source.