favicon for my GWT webapp is not showing [closed]

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I add a favicon.ico under my war directory but it is not showing up when the app is running in Development mode. W开发者_运维知识库hy? When I run the Mail sample app in Development mode, its favicon is shown correctly in Firefox.

Info: I'm using GWT version 2.0 in Eclipse galileo

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It's working now. I deleted the file & redeployed another version of favicon.ico & it now appears in the FF browser bar.