cookie auto delete support white listing certain cookies for certain domains. Unless OP want a plugin that can automatically figure out what cookies are required to stay logged in for what domain which is impossible

If there is a problem with memory, windows wouldn’t have worked too.

Highly doubt memory is the issue but doesn’t hurt to check

Errors and Warnings obviousky.

you coukd redirect the output to a file

sudo journalctl -e > log.txt and upload it sonewhere for us to check

I couldnt understand what exactly is KDE gears? If it fixes bugs in KDE, why those bugs are not fixed directly in KDE code?

The Mozilla report in case some readers missed it: https://foundation.mozilla.org/en/privacynotincluded/articles/its-official-cars-are-the-worst-product-category-we-have-ever-reviewed-for-privacy/