I didn’t expect there will be an RC3 for Firefox 1.5 but I guess having more release candidates is better because more bugs could be fixed before the final build is released.
This release does not include new feature but only several bug-fixes according to Squarefree. It’s only 218 Kb download and is very stable already so Firefox 1.5 final should be just around the corner.
Links:
Firefox official website
MozillaZine
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