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A comment on Firefox displayed a pop-up ad for Mozilla VPN over an unrelated page. Parent comment

Re:Firefox displayed a pop-up ad for Mozilla VPN over an unr... by adastra22 on Friday May 26, 2023 @02:10AM (#36080624)
At least on my chromium variant each private window (not tab: window) gets its own isolated environment.

I frequently use this to log into websites with different user accounts for testing purposes.

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Re:Firefox displayed a pop-up ad for Mozilla VPN over an unr... by lolinder on Friday May 26, 2023 @02:37AM (#36080786)
Good to know, I'll take a look!
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Re:Firefox displayed a pop-up ad for Mozilla VPN over an unr... by adastra22 on Friday May 26, 2023 @10:12AM (#36084422)
To be a little more explicit, I think you need to spawn a private window from a non-private window to get a new environment. If you do it from another private window it uses the same sandbox.
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