The default name for a sync device used to be "${username}'s ${channel} on ${deviceName}" - now it's "${username}'s ${channel} on ${userAgentString}" - eg, for me it is now "skip's Nightly on Windows NT 6.1; WOW64" Bug 1361601 removed system-info.getProperty("host"), which is how we got the host name. It appears we can still get it via Cc["@mozilla.org/network/dns-service;1"].getService(Ci.nsIDNSService).myHostName

Comment on attachment 8873321 [details] Bug 1369285 - update how we build the default sync device name. https://reviewboard.mozilla.org/r/144784/#review148848 Looks good w/ nits addressed (and nice catch on the issue!) ::: services/sync/tests/unit/head_helpers.js:493 (Diff revision 2) > }); > } > // Avoid an issue where `client.name2` containing unicode characters causes > // a number of tests to fail, due to them assuming that we do not need to utf-8 > // encode or decode data sent through the mocked server (see bug 1268912). > +Utils._orig_getDefaultDeviceName = Utils.getDefaultDeviceName; // stash away the old. Nit: can you explain in this comment that we're stashing it away so that it can be used in the device name test? ::: services/sync/tests/unit/test_utils_misc.js:3 (Diff revision 2) > +_("Misc tests for utils.js"); > + > +add_test(function() { Nit: This test is missing a name.

Pushed by mhammond@skippinet.com.au: https://hg.mozilla.org/integration/autoland/rev/a720da302ea4 update how we build the default sync device name. r=tcsc