Conflict between plugins

I’m getting this JS error on Chrome 26.0.1410.43 m / FF 19.0.2 on Windows using Front End Editor 2.3 and Highlight Search Terms 1.2.4 on WordPress 3.5.1:

Uncaught TypeError: Object function (o){
        var index = this.indexOf(o);
        if(index != -1){
            this.splice(index, 1);
        }
        return this;
    } has no method 'replace'

/wp-content/plugins/highlight-search-terms/hlst-extend.js, line 1

Deactivating Highlight Search Terms fixes the problem for me. I didn’t see the error before until I added FEE. It’s not mission-critical that HLST works for my site, but it would be nice! Not sure which thread to support forum to send this issue to, since it seems to come from the interaction of the two plugins. Thanks in advance!