[laurent123456]

I don't write JS-heavy websites these days so I don't have a technical example to give, but for instance I've opened the Vue cinema website recently on Firefox mobile. The thing was unusable - when I typed my postcode, nothing would show up on screen, the whole website seemed frozen while waiting to load something. I had to press several times certain buttons for something to happen.

On Chrome however everything worked fine right away. Overall it was just a few images, some text and a search bar, so no matter the performances of the browser that should work everywhere, but since it was probably only tested on Chrome and Safari, it only worked in these browsers.