this post was submitted on 07 Jul 2025
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362
Anubis, The Opensource Defender Against AI Bots: I fight bots in my free time (xeiaso.net)
submitted 5 days ago by [email protected] to c/[email protected]
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[–] [email protected] 12 points 4 days ago (9 children)

Why does default config check Mozilla specifically?

{
"name": "generic-browser",
"user_agent_regex": "Mozilla",
"action": "CHALLENGE"
}

Guess that's why I've seen Anubis check screen quite a few times.

[–] [email protected] 20 points 4 days ago (1 children)

Afaik, almost every browser uses "Mozilla/5.0" as part of the user agent, Mozilla mentions it as well in developer docs about User agents, it's a historical compatibility thing apparently.

[–] [email protected] 5 points 4 days ago (1 children)

Interesting, thanks!

Guess it's the same kinda thing as amd64 on Intel lol

[–] [email protected] 10 points 4 days ago* (last edited 4 days ago) (2 children)

it's even stupider, it's more like why there is no windows 9 because of programs doing stuff like if os.name.startswith("windows 9") then print("this program is not compatible with windows 98") end

[–] [email protected] 4 points 4 days ago (1 children)

Yup. There was a time when Mozilla was somewhat dominant, so browsers unlocked features based on the browser being Mozilla (as opposed to Internet Explorer).

[–] [email protected] 4 points 4 days ago* (last edited 4 days ago)

well if you want to get into it, i think the last browser that didn't have mozilla in the useragent was internet explorer, which had "trident/9.0" or something. every other browser on the market is based on the old KDE browser Konqueror, which had "khtml, like gecko" in it. when that didn't work they just added "mozilla" to it. then apple took that codebase and added "safari", chrome took that codebase and added "chrome", etc etc etc. compatibility problems just kept compounding on every browser based on khtml until we got to the point where microsoft edge's current user agent is Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36 Edg/134.0.0.

even firefox has had to give in to this: my useragent is Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0 even though the version of gecko in firefox 140 is v125, from 2022.

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