Testing w/Selenium against app running in Eclipse demands Firefox Development Mode Plugin

Using GWT 2.4.0, Eclipse Kepler, Firefox 25.0, JDK 1.7.0_40, TestNG 6.8.5

When I run my test suite against the GWT app running on a Tomcat server, all is well.

When I try to run it against a local copy running in Eclipse, instead of bringing up my application, Firefox gives me:

    Development Mode requires the GWT Developer Plugin

with a badge to click on to download the plugin.  It does this no matter how many times I have downloaded and installed the plugin and re-started Firefox.

Ideas?

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