I use corporation's websites to find its workers phone numbers. Websites for all regions around the country have the same layout but sometimes frames with names, adress and phone numbers are individualy designed. I use mobile browser on Galaxy S series smartphones. When I mark phone number it is not recognized by any dialer. When I try the same on other browser i.ex. Brave it recognize it without any problems. No matter how web frame is designed. I guess this is an issue for Mozilla developers to check out. Personally I dont see any custom settings to change it.