Notify, or optionally block, site visitors that they are using an outdated web browser, so you can use html5, css3, etc. freely.
Visitors using rejected browsers can still access your site, but are initially presented with a prominent browser warning that overlays your site. Visitors with blocked browsers cannot dismiss the rejection modal, and will need to update or use another browser to access it.
Set the plugin to allow visitors to close the window. At the bottom of the page an option to reject ie6/7/firefox 3 completely. If you want to completely block others, just enter them in the
browsernamev# format in the field for browsers to block access on (for example,
safari would block all versions of Safari that are being rejected at all,
safari5 would block Safari 5 if it is being rejected, including mobile versions of Safari). Be very careful with the restrictions of mobile browsers, for example, Internet Explorer 9 is the only browser available on Windows Phone 7, so blocking it would prevent visitors from accessing your site with their device. For historical reasons, the Android 3.x browser identifies itself as Safari 4. While Safari 4 should be rejected, Android shouldn't be.
No problem, just uncheck all of the other browsers in the Browsers to Reject tab.
It's under settings: Settings -> Browser Rejector. And on a side note, the tabs on the settings page are showing different parts of the same page, not refreshing the browser, so you can switch between tabs without needing to save (and you are always returned to the rejection window tab when saving).
Unfortunately, no. If it were possible, IE would be blocked on Windows XP as IE9+ is not available there. If anyone has a suggestion for how to accomplish this, please let me know! I might look into grabbing the Windows NT 6.x, etc. part of the user agent string...
As of Safari 6, Apple has quietly stopped development of Safari for Windows. Safari for Windows was never a serious contender compared with the other browsers anyway.
The Opera browser is much less known than Chrome, IE, Firefox, and Safari, but it does have some market share and is a solid modern browser around the IE9/Firefox overall quality level. Konqueror is a Linux broswer and is not included in the plugin options because it is so little-used. Versions 1-3 are rejected by the plugin automatically, however. Other more obsure browsers can be rejected by manually entering their rejection terms in the browsers to reject field.