Canmove, confirm
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We You can find the regression range using a wonderful semiautomated tool called [https://mozilla.github.io/mozregression/ mozregression], and hopefully identify the code which caused the regression behavior.
→Easy:: nit
For these bugs it is very helpful to know the "regression range", the 1-day range of changes that broke Thunderbird. A bug whose regression range has not been determined also has a bugzilla keyword '''regressionrange-wanted'''.
== '''Moderate:''' ==
