My project has multiple files with many lines of code. After I was finally able to access it (no more Bad Gateway error), now I have another problem. Every time I change a tab (not a browser tab, but a tab with source code file inside the editor) and then return to the last one, its scroll (line) position is changed to first line or some other line quite far from where I left it. This happens even if the cursor position was in the center of the screen when I left that tab, so it's not going to the cursor position either. For a small file that won't be a big problem, but with multiple files of more than 1000 lines this is wasting a lot of time.
I am using Firefox 47.0.1, Windows 7 64Bit. Same thing happened at home on latest Firefox and Windows 10 64Bit.