From the Google Docs blog:
As of August 1st, we will discontinue support for the following browsers and their predecessors: Firefox 3.5, Internet Explorer 7, and Safari 3. In these older browsers you may have trouble using certain features in Gmail, Google Calendar, Google Talk, Google Docs and Google Sites, and eventually these apps may stop working entirely.
So if it’s been a a while since your last update, we encourage you to get the latest version of your favorite browser. There are many to choose from:
Our plans to support modern browsers across Google Apps - Docs Blog
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