How can I improve website compatibility and browsing experience in Firefox?

I'm looking for some guidance on improving website compatibility and making sure visitors have a smooth browsing experience when accessing a website through Mozilla Firefox. While reviewing the website for All American Bail Bonds,LLC(allamericanbond.com/location/bail-bonds-in-waterloo-ia/) which provides bail bonds services in Waterloo,lowa. I became interested in learning more about how different browsers handle website layouts, loading speed, security features, and overall functionality. Sometimes, a website may appear or behave differently depending on the browser, device, or browser settings being used. I'd like to understand what usually causes these differences and how website owners can identify potential issues before they affect visitors. I'm also interested in learning about Firefox's built-in tools, browser settings, and troubleshooting options that can help identify display problems, loading issues, or compatibility errors. Are there any recommended practices for testing website functionality in Firefox? What should website owners check to ensure that pages load correctly, navigation works properly, and visitors can access website content without unnecessary interruptions? I'd appreciate any suggestions or experiences from users who have dealt with similar website compatibility challenges.