found browser-plugin-evince/3.21.4-1 thanks The used version of firefox-esr is 45.3.0esr-1~deb8u1 A file which cannot be opened is, e.g., http://www.math.chalmers.se/~palbin/rickard.ps The browser hangs for a few minutes, then the blank tab is displayed. In fact, no postscript file can be opened from the browser.