I am working on the front-end of a website and need to see how my code behaves in different systems/browsers. Firefox and Chromium do have development tools that allow the display to be set to different sizes, but they are unable to fully emulate Apple's upscaling mechanism and the sites will still look slightly different. Also they don't take into account different browsers.
Is there any tool or software I can use with Ubuntu to check what my site will look like on different devices/browsers?