Created attachment 8357083 [details] Example of the problem User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:26.0) Gecko/20100101 Firefox/26.0 (Beta/Release) Build ID: 20131205075310 Steps to reproduce: This problem was discovered following the comments on this stackoverflow question http://superuser.com/questions/697926/in-modern-webbrowsers-is-there-any-point-in-putting-www-infront-of-a-url-that-us It appears that some links fail to load when clicked on normally but if they are opened in a new tab they load. For example if following a link to vim.org (notice how www. is missing from the front of it) FireFox displays "server not found". However, if the link is clicked on with the middle button or if "open link in new tab" is selected from the context menu, the page loads and the www subdomain appears to be appended to it. Actual results: Depending on if a link is followed normally (e.g. left clicked) or if it is opened in a new tab, different pages load. Expected results: The same page is (or error message) is loaded no matter how the link is selected.
I have successfully reproduced the bug on nightly 29 linux x86_64. [bugday-20140113]
Severity: normal → major
Status: UNCONFIRMED → NEW
Ever confirmed: true
OS: Windows 7 → All
Hardware: x86_64 → All
Version: 26 Branch → Trunk
I was able to reproduce with the following specs Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0 20160107030235
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