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Firefox will not open a file requiring javascript, then hangs; forced close is the only solution

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Firefox 3.6.6 opens OK. Browsing OK, until I try to open a file that requires Java. The file will not open & Firefox immediately hangs. The only way out is a forced closure. Often getting a "This is embarrassing message" at the Firefox start-up. 2 choices are given - start new session or start up with previous tabs.

This happened

Every time Firefox opened

== After updating Firefox to 3.5 & 3.6.6

Firefox 3.6.6 opens OK. Browsing OK, until I try to open a file that requires Java. The file will not open & Firefox immediately hangs. The only way out is a forced closure. Often getting a "This is embarrassing message" at the Firefox start-up. 2 choices are given - start new session or start up with previous tabs. == This happened == Every time Firefox opened == After updating Firefox to 3.5 & 3.6.6

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requires javascript.