Gerrit's "All side by side" doesn't open diffs in new tabs

Question

Short version:

On each Gerrit review there's an Open All button which used to open every diff in new tabs.

This behavior suddenly changed a week ago: now it opens a new window per file. I haven't been able to understand why, although I googled this issue.

Do you know what can explain this change, and how I can get back to the previous behaviour?

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Steps to reproduce the issue

1. Go to https://android-review.googlesource.com/#/c/82097/ with Firefox
2. Click on the Open All button
3. Notice it opens a lot of new windows rather than new tabs

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More practical details:

• Our Gerrit setup hasn't change
• I observe this behavior with firefox (FF 27). The option Tool > Options > Tabs > "Open in a new tab rather than a new windows" is activated. (I don't know which version of firefox I had last week though)
• I have the same behavior with Internet Explorer 9
• I have yet another behavior with Chrome and Opera, but it doesn't work either (it only opens a new tab with the commit message. Other diffs aren't shown).
• I'm on Windows

Answer 1

In Firefox try setting browser.link.open_newwindow.restriction=0 in the about:config menu. This solved the problem for me.

Answer 2

I'm new to Gerrit. Using Chrome I was mystified at the meager results when I clicked any of the Diff buttons. Thanks to this thread I tried Gerrit in Safari and I'm seeing the diff presentation I expect and can use.