Last year Google pulled the Support of Google Apps for Firefox 3.5, Internet Explorer 7, And Safari 3 . Users running those browsers may have trouble with some features in Gmail, Google Calendar, Google Talk, Google Docs, Google Sites and Google+. At some point, those apps may stop working entirely.
According to Google the Google profiles are supported in the following browsers:
Windows: Chrome, Firefox 3.6, Internet Explorer 8, Internet Explorer 9
Linux : Chrome, Firefox 3.6
Mac: Chrome, Firefox 3.6, Safari 4
So for those who are using IE7 and want to use Google+ or any other Google apps. Its time to upgrade your browser!