Google has warned Google Apps may stop working on old versions of some web browsers as it plans to pull support from the beginning of August.
Google said it needed to use capabilities in modern browsers - for purposes such as desktop notifications for Gmail, drag-and-drop file uploading in Google Docs and HTML5 support - to allow web applications to progress further than traditional software,
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Writing on a blog post, Venkat Panchapakesan, vice-president of engineering at Google, said: "Beginning August 1st, we'll support the current and prior major release of Chrome, Firefox, Internet Explorer and Safari on a rolling basis."
"Each time a new version is released, we'll begin supporting the update and stop supporting the third-oldest version," added Venkat Panchapakesan.
Google will discontinue support for Firefox 3.5, IE7 and Safari 3 from 1st August 2011.
"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," Panchapakesan said.
The Firefox 5 beta includes additional support for CSS (cascading style sheet) animations, web standards including HTML5 and better desktop integration for Linux users.