I thought it no longer worked, but the option seems to have been renamed in VueTorrent to "Enable Cross-Site Request Forgery (CSRF) Protection"
it must be disabled in order to work

Works great.

无法打开BitComet或者qBittorrent的下载页面

BitComet best download mag. all feathers,load 1000 at a time,runs fast fart, shows all info. for each file working. FREE to download, using with FireFox 6 years on problems.

Great addon! Been looking for one that supports adding the torrent and specifying the category through a submenu or dialog window. Great job.