Oh frak. @AdamR, at least in @home.pjs’s case, I know what’s the issue and who’s what’s to blame: me the updated profanity filter. The u flag, enabled to block some accented Portuguese words, isn’t supported by old, pre-ES6 browsers. I’ll take care of this.
EDIT: Opened an issue, updated the filter and submitted a pull request. Sorry for the trouble, everyone.