I know you've said you've tried various browsers, which one were you using to achieve the above?
At times, i've had cart and authentication issues when my privacy settings are cranked way up. Sometimes the chatbot won't work either. I recall reporting an issue with Firefox on a site to the site owner/dev, and they fixed the site.
TBH, i don't think i've ever seen or heard of an example where a site doesn't work because of the operating system.
As a web developer, I think it highly unlikely that a site would be coded to be OS-specific. It is far more likely that it is the browser security settings.
I have not yet encountered any site anywhere that worked differently for me in Linux compared to Windows. I do think it is a good idea to use different browsers for different purposes, with differing security levels.
Basically, a totally secure browser will not be able to function as a browser in the way that we have become accustomed to online.
Vivaldi but also tried Brave, Firefox and Chrome
