I always use the crome to do my tests on the pages I'm developing there in the crome, everything is ok ... But when I render the same page in firefox, the letters are slightly flattened and the measurements and spacing of the elements are different. ............. For example, in the crome, a button is one size and behaves correctly, but in firefox the same button gets smaller or larger and still behaves different ... The technologies I use are just HTML5, CSS3 and Flexbox basically ...