Features PC AMD FX8120, 16 GB of RAM. I downloaded Firefox 38 to the office site, no additional plug-ins and extensions. When you open tabs in Firefox 50+ - highly Firefox begins to slow and the entire computer. In Chrome - 200+ tabs open - everything works perfectly. Why do you disfigured normal browser Firefox. ?? Starting with Firefox 10+, Firefox is working slowly. In Firefox 38 version you have made a brilliant break !! - Released the slowest in the world among all browser versions of Firefox 1-38. Stop the shame, making Firefox worse. Remove your hands from the ass and start writing the normal version of Firefox users, but not for himself. I hope this letter will reach the developers. In the first place should be the speed, reliability browser rather than curves hands of programmers unable to optimize the code.