DXR will be turned off on Tuesday, December 29th. It will redirect to Searchfox.
See the announcement on Discourse.

DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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5c07c82cd087d8e12592a740d7737ba9d2d472e6 THUNDERBIRD_3_0a3_RELEASE
5c07c82cd087d8e12592a740d7737ba9d2d472e6 THUNDERBIRD_3_0a3_BUILD2
79d4f2920eb2304a86a8bd9ef1da65c4ab947b0e THUNDERBIRD_3_0b1_RELEASE
79d4f2920eb2304a86a8bd9ef1da65c4ab947b0e THUNDERBIRD_3_0b1_BUILD1
cbbafdf2664ebe7cbffc03870c078de147585306 GECKO_1_9_2_BASE