The Cu.import and XPCOMUtils.defineLazyModuleGetter APIs have been replaced
with nearly-equivalent ChromeUtils.import() (bug 1431057) and
XPCOMUtils.defineModuleGetter() (bug 1431533) APIs. Existing uses of the old
APIs have been automatically rewritten, and a new ESLint rule has been added
to prevent new instances.
The new APIs are much more efficient than the old versions, but otherwise
behave more or less the same way. The old versions will likely be removed
after the new APIs are available in all of our release branches.
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