I'm encountering a strange issue with Gmail where it will freeze and crash the browser tab within a few seconds of accessing it (while logged in or after logging in). It seems to be consistent across browsers and platforms — it happens in Chrome 40 and Internet Explorer 11 under Windows 8 on my personal laptop, and in Chrome 40 under Ubuntu 14.04 on my desktop at work.
I managed to quickly access Settings and disable the People widget as suggested here, but it did not help.
Best Answer
I just tested in Firefox 37 under Ubuntu and finally got a useful error message:
It seems like it might be related to this bug report.
Following this I turned off Chat:
That seems to have fixed the issue.