E.g.: [const unsigned long BUTTON_POS_2_DEFAULT = 1 << 25;](https://searchfox.org/mozilla-central/rev/d23849dd6d83edbe681d3b4828700256ea34a654/toolkit/components/windowwatcher/nsIPromptService.idl#254) vs [const unsigned long BUTTON_POS_2_DEFAULT = 2 << 24;](https://searchfox.org/mozilla-central/rev/d23849dd6d83edbe681d3b4828700256ea34a654/netwerk/base/nsIPrompt.idl#54) Digging in is surprisingly involved (see bug 99615) but it seems this requires the values to be identical.
Bug 1891554 Comment 0 Edit History
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E.g.: [const unsigned long BUTTON_POS_2_DEFAULT = 1 << 25;](https://searchfox.org/mozilla-central/rev/d23849dd6d83edbe681d3b4828700256ea34a654/toolkit/components/windowwatcher/nsIPromptService.idl#254) vs [const unsigned long BUTTON_POS_2_DEFAULT = 2 << 24;](https://searchfox.org/mozilla-central/rev/d23849dd6d83edbe681d3b4828700256ea34a654/netwerk/base/nsIPrompt.idl#54) The values are identical but needlessly altered.