"Prove that you are human" CAPTCHA screens when visiting site

Glad to help. If it's not at random, what criteria are used to trigger when it happens? Is there some reason why I've never seen it before in 20-odd years of using IMDB, until this week when it's happened about ten times with no discernable pattern to when it does/doesn't happen? I've seen it on two different PCs (both Firefox) which are both logged into the same account.

Hi martin_695821, appreciate the added detail. I am unable to publish exact signals, but in general the system looks for traffic patterns that could resemble automated activity. If it is unsure, it shows a quick CAPTCHA to confirm you're a human. You can find a bit more background in our Help Center article here: https://help.imdb.com/article/imdb/general-information/why-do-i-need-to-enter-a-captcha/G2V9QZ39J4J8Z2KV?ref_=helpart_nav_38# I've passed your specifics to the team as well. Thanks again for helping us accurately keep IMDb secure.

Hmm. I appreciate why you need to keep secret the precise details of what the algorithm looks for. The mystery is what I've started doing differently this last week that I've not been doing up to now, which has just started triggering it. As a matter of interest, has anyone else noticed that they have just started seeing the CAPTCHAs when they didn't previously. I wonder if the behaviour of Firefox has changed in a recent version which is sending different feedback. My impression is that is seems to go in phases - I have some days when I get it fairly frequently and others when I don't see it at all. I've seen it both when I've been displaying read-only information (ie that other people have submitted) and when adding/correcting information, so it's not just protecting the Update system from bots. Is the CAPTCHA that your refer to in your link the same one that I'm talking about? Your link seems to be used for protecting IMDB from robotised creation of accounts, and displays mangled text that only a human can decipher. The one I'm seeing involves clicking on those pictures which match some instruction. Maybe they are almost one and the same, and the nature of the sign-up CAPTCHA has changed since the help article was written.

Good catch, @martin_695862. Your browser details are helpful, and I've added them to the team's ticket for investigation. You're also right that the Help Center's CAPTCHA article is too narrow. We will update it to cover every CAPTCHA scenario, including image challenges at sign-in. Thank you for raising the bar and helping improve IMDb's security.