To reproduce the bug: - 1. - Click 3 times on the "find w-o-r-d" button, the text in the iframe should be selected now 2. - Reload the page 3. - Click again on the "find w-o-r-d" button 4. - Error appears in error console 5. - Reload page again. WebFinder behaviour is correct once more. 6. - Continue reloading page and testing. Behaviour continues in this pattern: First reload will cause NS_ERROR_FAILURE, next reload normal behaviour resumes
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