I usually see what new switches have been added; or when they're removed. I use this link: -https://src.chromium.org/svn/trunk/src/chrome/common/chrome_switches.cc If you look for no-referrers, you won't find it there. So, sometime ago I removed that switch from my batch file. I then started to use the extension ScriptNo, which didn't work quite well with Chromium builds. So, I was looking for info that could point to clues that pointed the reasons why no-referrers was removed. This is actually embarrassing, because I'm familiar with the following link, but I always thought it was the same deal as the above link. -http://peter.sh/experiments/chromium-command-line-switches/ In this link, you'll see that no-referrers is there. In fact, I just re-added it to my batch file and went to Dshield test page, where one can check the browser header -https://secure.dshield.org/tools/browserinfo.html It is working. I actually should have made that test before deleting the switch, back then. Just in case you also believe this or that switch was removed, it may have not been removed. I wonder why -https://src.chromium.org/svn/trunk/src/chrome/common/chrome_switches.cc lacks, at least, no-referrers? This is why one shouldn't put blind faith on anything. Lesson learnt.