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Bug 1574248 Comment 2 Edit History
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Rather hard to test :( Looks like (part of) the code is around here: https://searchfox.org/comm-central/rev/cb71ec93ae822bce37fb00e321ef201cce24ff1e/mailnews/extensions/smime/content/msgCompSecurityInfo.js#44 xref bug 1275180 and bug 1509586 comment 6.