@cheong said in Microsoft: IE fucked up everything and wasted untold billions of man-hours. Maybe don't use it anymore?: Checked yesterday that even old links to previous WAR file that could not be previewed before can be viewed without problem now. Maybe they have fixed it these 2 months (Pretty sure it still not working during the first half of January). After Chrome update today (possibly earlier because I've not received new deployment request in a while), I found that Chrome is now the only browser that can show WAR file preview. Both IE and Firefox will be shown the "Whoops! There was a problem with the preview." screen. In all 3 browsers the upper right corner download link can still download the file, but only IE can start the download within 20-ish seconds. Chrome and Firefox need to wait much longer. The whole behavior is very strange...