Earlier quoted context omitted.
Because that "feature" existing points to a serious ethical failing and conflict of interest on the part of the author (namely, taking money to help advertisers bypass the plugin) Firefox plugins auto-update, who's to say the next update won't have something more objectionable?
I just noted that Adblock Edge is still based on version 2.0.4 of Adblock Plus, which is outdated for a while. It seems that Adblock Edge isn't maintained anymore and probably never was. So Adblock Edge will probably get incompatible with future versions of Firefox, anyway. And if there are security issues in the code, it is rather unlikely that they will get fixed, as fast as in upstream Adblock Plus, if at all. On…
This is analogous to an antivirus vendor taking money from malware authors to avoid detecting the worm of the day, the only difference being that a text ad isn't as likely to frag your computer.
But hey, in both cases, they're getting money to "maintain and improve the product".