Google takes down Chrome extension targeting Jews

"Coincidence Detector" singled out Jewish people online by putting three sets of parentheses around their names.

It compiled the list of names by asking people for suggestions, although it's unclear how many names were in the database. If a website contained a specific name on that list, the plug-in would place parentheses around it.

The use of triple parentheses dates back at least a year. Anti-Semites and white supremacists have been using it as a symbol of their movement online.

Google removed the Coincidence Detector extension from its Chrome store at 9:30 p.m. ET Thursday, said a spokeswoman. She said it violated the company's hate speech policy, which doesn't allow "content advocating against groups of people based on their race or ethnic origin, religion, disability, gender, age, veteran status, or sexual orientation/gender identity."

Before the Chrome plug-in was taken offline, it had been downloaded more than 2,400 times, according to Mic news. Google appears to have erased cached files of the website.

Google does not pre-approve software for its Chrome browser, according to the developer page. It's unclear if there have been other hateful Chrome extensions in the past. But there are plenty of extensions that attempt to block online bullying or poke fun at racism and Donald Trump -- such as Reword, Clarifier and Your Racist Uncle.