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In the firebug release downloads there are many different choices. Many versions have an a or b appended to the name. What does this mean?

For example:

firebug-1.8.0 a3 .xpi


firebug-1.8.4 b1 .xpi

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up vote 2 down vote accepted

Those are alpha and beta versions.

Normally, it is a good idea to stick to the stable releases.

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