On doc.ez.no the requirements pages for all 4.x versions should include a supported browsers list.
That list is available in "The administration interface" chapter. These pages should be linked.

Example
Requirements, no browser related information:
http://doc.ez.no/eZ-Publish/Technical-manual/4.7/Installation/Normal-installation/Requirements-for-doing-a-normal-installation
http://doc.ez.no/eZ-Publish/Technical-manual/4.x/Installation/Normal-installation/Requirements-for-doing-a-normal-installation

The administration interface, which includes supported browser information:
http://doc.ez.no/eZ-Publish/User-manual/4.7/The-administration-interface
http://doc.ez.no/eZ-Publish/User-manual/4.x/The-administration-interface