Currently website is optimized for Google Chrome so please use that browser for the time being. Development team is aware of the Mozilla issue and fixing this is in our roadmap.
Fast response to community answer, and the team presented nice initiative to fix current issues with Mozila Firefox browser.
I wish that issues will be solved completely till the open of promotions as Hhampuz disclosed.
I wish the MatchBillion platform all the best for the start and next hard months. I say hard months because gambling is very competitive industry.