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I just tried to add some details to a bug I have reported at bugzilla.mozilla.org (BMO) but wasn't let in because my password had been nullified. Now they want me to create a new password meeting certain requirements, listed here

https://wiki.mozilla.org/BMO/UserGuide/Passwords

must be at least 12 characters in length
must not contain parts of your email address, or your real name
must be complex, which means:
    must be a passphrase of at least four words
    OR
    must contain a mixture of letters and symbols, containing characters from 3 out of the following 4 character classes:
    lowercase letters, uppercase letters, numbers, and other symbols

I decided to not update my password, and, as a consequence, stop using their service/provide BMO with bug reports, because the password they require won't be easy to memorise and I think this is unnecessary complex for a bug reporting service. My current password is 9 characters, contains upper- and lowercase letter, numbers as well as special characters. That is complex enough for my purpose.

So my question is: are there any objective reasons for such a complex password for something like BMO? What is the worst thing that can happen if someone cracks an outside users password there?

Finally some personal remarks about this issue: personally I am not too found of the thought of a password manager in the cloud (which is was BMO recommends). That type of single-point-of-failure is, IMHO, problematic. Even if CIA/NSA or similar might not target me specifically, they most likely might target someone else using the same service and if they manage to break it, all my secrets come as a free bonus for them.

Storing sensitive data locally and have good backup solution seems much safer for the occasional hacking attempt from a jealous partner or someone trying to commit credit card fraud (if some state sponsored agency targets me specifically I am screwed anyway, either by using a secret subpoena, technically circumvent my protection or simply threat me with a big enough stick).

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    four word passphrase? Always check if you can break into another account using "correct horse battery staple"
    – Hagen von Eitzen
    May 6, 2018 at 12:47
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    Link does not say "password manager in the cloud", so that entire paragraph is moot. You also have an incorrect understanding of the technology used to store passwords in the cloud.
    – schroeder ♦
    May 6, 2018 at 15:08
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    From another part of the BMO wiki: "BMO is a core piece of infrastructure at Mozilla. It is used to track not only bugs and feature requests but also many other tasks across various teams." so, yeah, password complexity is required
    – schroeder ♦
    May 6, 2018 at 15:09
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    @schroeder that's my impression as well - this is the kind of user that needs a password manager, because they will make bad password decisions without one, e.g. reuse with minimal variation and so on.
    – vidarlo
    May 6, 2018 at 15:41
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    @d-b: multiple devices w/local manager: just put a local copy on each device (including your phone). Cloud PW managers: good ones never see your master password, attackers can only get encrypted data, you're safe from someone else's account hack. Someone else's computer: is this really something you do frequently? You can occasionally bring up the PW manager on your phone and type in the PW manually. The 4+ words passphrase is easy to type this way.
    – Ben
    May 7, 2018 at 16:31

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So my question is: are there any objective reasons for such a complex password for something like BMO? What is the worst thing that can happen if someone cracks an outside users password there?

Remember that the bug tracker may contain information pertaining to 0-days in the software, or other serious security bugs. Not all users have access to this information, but some do.

Such information may impact a large number of users should it become publicly known.

It's easier and better to enforce password policies for all users, and not depending on group. Many password hashing schemes will hide the complexity of the passwords, which means that it is only verifiable when actually changing the password.

because the password they require won't be easy to memorise

I memorize exactly three passwords: my computer account password, my remote access password and my password manager passphrase. The rest is stored in password managers (Lastpass and KeePass). This is suggested by the user guide you point to. This makes it easy to use unique passwords for each service, and you don't have to remember anything.

In addition, they do allow passphrases, which is easier to memorize. Four random words is certainly possible to remember, if you desire.

Finally some personal remarks about this issue: personally I am not too found of the thought of a password manager in the cloud (which is was BMO recommends).

They recommend a password manager. They don't mention a specific one, and does not mention cloud based at all. You should probably read the page you linked once more, as you infer things that is not stated there.

In addition it should be noted that Lastpass uses your passphrase as an encryption key for your data, so an attack against a different user may not yield your passwords.

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