As a recent post on the WatiN forum (sorry, no link). Jeroen (WatiN conceptor) proposed making WatiN compatible with FireFox (or another browser) using the Selenium web driver.
The problem arises from the JSSH plugin, which WatiN depends on the management of FireFox, which is currently not supported / compatible with FireFox version> 3.6.
But there is no compromise when it will be done, if it will be done at all.
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