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A comment on Facebook uses bgsound to see if you have opened an email. Parent comment

Re:Facebook uses bgsound to see if you have opened an email by silon3 on Monday March 05, 2012 @02:07AM (#3665740)
For me, Thunderbird had a dns-prefetch leak, but it's fixable via config.
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Re:Facebook uses bgsound to see if you have opened an email by vimalg2 on Monday March 05, 2012 @02:16AM (#3665764)
Seems, the author has already documented this.

For those interested: https://grepular.com/DNS_Prefetch_Exposure_on_Thunderbird_an...

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