Last time I explored this, Firefox rendered thin lines in subtly bordered tables as thick lines, so I had to use Chromium. But back then Chrome did worse at pagination than Firefox.

So I used Firefox for multi-page documents and Chromium for single-page invoices.

I spent a lot of time with different versions of both browsers, and numerous quirks made a very unpleasant experience.

Eventually I settled on Chromium (Ungoogled), which I use nowadays for invoices.