Hi @zechau, I was using Airdroid. Obviously I can't any more, as it is simply too troublesome to enter the IP address each time to use it. But it was a great program before reaching 2.x series 
Testing with Opera yields these errors: (Adding CSS to the mix):
[26-01-2014 16:15:39] CSS - http://web.airdroid.com/
DOM style property
Invalid value for property: zoom
Line 1:
1
-^
[26-01-2014 16:15:42] JavaScript - http://cdn1.airdroid.com/V2081401231936 ... ource_2.js
Linked script compilation
Syntax error at line 4 while loading: expected ')', got 'stock'
tImgAssets(" class="stock" style="positi
--------------------^
[26-01-2014 16:15:42] CSS - http://web.airdroid.com/
DOM style property
Invalid value for property: width
Line 1:
121
---^
[26-01-2014 16:15:42] JavaScript - http://web.airdroid.com/
Event thread: load
Uncaught exception: TypeError: Cannot convert 'Airdroid.CenterManage' to object
Error thrown at line 1, column 2845 in() in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
Airdroid.Util.trackEvent("Desktop","Init"),Airdroid.CenterManage.init(),$("#block-loading").remove(),$("#block-wallpaper").removeClass("hide"),Airdroid.Util.trackEvent("Desktop","Finish"),Airdroid.Runtime.Referrer=document.referrer,eval('head.js("'+Airdroid.Config.fileList.bg.join('","')+'",function(){bgListLoad();});'),"en"!=Airdroid.Runtime.locale&&head.js(Airdroid.Config.baseUri+"assets/momentLang/"+Airdroid.Runtime.locale+".js"),Airdroid.AppManage.getLabConfig()
called from line 1, column 1025 in(e, t) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
loading_bar.style.width=n>i?i:n+"px",loading_bar_text.innerHTML=o>100?"100%":o+"%",Airdroid.Config.fileList.resource.length>e?head.js(Airdroid.Config.fileList.resource[e],function(){runLoading(e+1,t)}):t()
called from line 1, column 1569 in() in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
runLoading(e+1,t)
called from line 1, column 11554 in d(e) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
e=e||i,e._done||(e(),e._done=1)
called from line 1, column 15585 in() in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
l(i)&&d(t)
called from line 1, column 12496 in h(e, o) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
return o=o||i,e.state===I?(o(),t):e.state===M?(D.ready(e.name,o),t):e.state===x?(e.onpreload.push(function(){h(e,o)}),t):(e.state=M,f(e,function(){e.state=I,o(),n(A[e.name],function(e){d(e)}),v&&l()&&n(A.ALL,function(e){d(e)})}),t)
called from line 1, column 15462 in(n, o) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
n!==t&&(n=c(n),i[n.name]=n,h(n,t&&o===e.length-2?function(){l(i)&&d(t)}:null))
called via Function.prototype.call() from line 1, column 10876 in n(e, t) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
t.call(e,e[i],i)
called from line 1, column 15348 in() in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
return r(t)||(t=null),n(e,function(n,o){n!==t&&(n=c(n),i[n.name]=n,h(n,t&&o===e.length-2?function(){l(i)&&d(t)}:null))}),D
called from line 1, column 1025 in(e, t) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
loading_bar.style.width=n>i?i:n+"px",loading_bar_text.innerHTML=o>100?"100%":o+"%",Airdroid.Config.fileList.resource.length>e?head.js(Airdroid.Config.fileList.resource[e],function(){runLoading(e+1,t)}):t()
[/quote]
Firefox has these: (Filtered to only show JS errors, as the list would be massive otherwise)
16:20:26.960 The Web Console logging API (console.log, console.info, console.warn, console.error) has been disabled by a script on this page.
16:20:27.217 Invalid URI. Load of media resource failed. web.airdroid.com
16:20:28.437 Use of getPreventDefault() is deprecated. Use defaultPrevented instead. required.js:2
16:20:47.848 Firefox can't establish a connection to the server at ws://ws.airdroid.com:8090/webNode?code= ... ace99aaad8. Login.js:1
[/quote]
Firefox actually gets to the page, where the QR code is supposed to be, but the page breaks down there instead.
Chrome with a new profile (created just to test with), still has the same errors (meaning there isn't any extensions or stuff like that to interfere, as it is a raw profile I tested with)
xxxterm also hangs at 100% - I don't know how to access a console log for that one.
Obviously, I can't test with something like Internet Explorer, as that product is Windows exclusive...
Long story short, I have a hard time believing you can't find any bugs. I've copied them, and linked to sites that show them... Any sane browser should stop processing a JS file, at the first error it encounters. I'd point to the specific line/word that triggers the error, but you've made a huge unreadable mess of those JS files. Putting (almost) everything on a single line. No wonder you have trouble debugging it!

Testing with Opera yields these errors: (Adding CSS to the mix):
[26-01-2014 16:15:39] CSS - http://web.airdroid.com/
DOM style property
Invalid value for property: zoom
Line 1:
1
-^
[26-01-2014 16:15:42] JavaScript - http://cdn1.airdroid.com/V2081401231936 ... ource_2.js
Linked script compilation
Syntax error at line 4 while loading: expected ')', got 'stock'
tImgAssets(" class="stock" style="positi
--------------------^
[26-01-2014 16:15:42] CSS - http://web.airdroid.com/
DOM style property
Invalid value for property: width
Line 1:
121
---^
[26-01-2014 16:15:42] JavaScript - http://web.airdroid.com/
Event thread: load
Uncaught exception: TypeError: Cannot convert 'Airdroid.CenterManage' to object
Error thrown at line 1, column 2845 in
Airdroid.Util.trackEvent("Desktop","Init"),Airdroid.CenterManage.init(),$("#block-loading").remove(),$("#block-wallpaper").removeClass("hide"),Airdroid.Util.trackEvent("Desktop","Finish"),Airdroid.Runtime.Referrer=document.referrer,eval('head.js("'+Airdroid.Config.fileList.bg.join('","')+'",function(){bgListLoad();});'),"en"!=Airdroid.Runtime.locale&&head.js(Airdroid.Config.baseUri+"assets/momentLang/"+Airdroid.Runtime.locale+".js"),Airdroid.AppManage.getLabConfig()
called from line 1, column 1025 in
loading_bar.style.width=n>i?i:n+"px",loading_bar_text.innerHTML=o>100?"100%":o+"%",Airdroid.Config.fileList.resource.length>e?head.js(Airdroid.Config.fileList.resource[e],function(){runLoading(e+1,t)}):t()
called from line 1, column 1569 in
runLoading(e+1,t)
called from line 1, column 11554 in d(e) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
e=e||i,e._done||(e(),e._done=1)
called from line 1, column 15585 in
l(i)&&d(t)
called from line 1, column 12496 in h(e, o) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
return o=o||i,e.state===I?(o(),t):e.state===M?(D.ready(e.name,o),t):e.state===x?(e.onpreload.push(function(){h(e,o)}),t):(e.state=M,f(e,function(){e.state=I,o(),n(A[e.name],function(e){d(e)}),v&&l()&&n(A.ALL,function(e){d(e)})}),t)
called from line 1, column 15462 in
n!==t&&(n=c(n),i[n.name]=n,h(n,t&&o===e.length-2?function(){l(i)&&d(t)}:null))
called via Function.prototype.call() from line 1, column 10876 in n(e, t) in http://cdn1.airdroid.com/V2081401231936 ... fig_web.js:
t.call(e,e[i],i)
called from line 1, column 15348 in
return r(t)||(t=null),n(e,function(n,o){n!==t&&(n=c(n),i[n.name]=n,h(n,t&&o===e.length-2?function(){l(i)&&d(t)}:null))}),D
called from line 1, column 1025 in
loading_bar.style.width=n>i?i:n+"px",loading_bar_text.innerHTML=o>100?"100%":o+"%",Airdroid.Config.fileList.resource.length>e?head.js(Airdroid.Config.fileList.resource[e],function(){runLoading(e+1,t)}):t()
[/quote]
Firefox has these: (Filtered to only show JS errors, as the list would be massive otherwise)
16:20:26.960 The Web Console logging API (console.log, console.info, console.warn, console.error) has been disabled by a script on this page.
16:20:27.217 Invalid URI. Load of media resource failed. web.airdroid.com
16:20:28.437 Use of getPreventDefault() is deprecated. Use defaultPrevented instead. required.js:2
16:20:47.848 Firefox can't establish a connection to the server at ws://ws.airdroid.com:8090/webNode?code= ... ace99aaad8. Login.js:1
[/quote]
Firefox actually gets to the page, where the QR code is supposed to be, but the page breaks down there instead.
Chrome with a new profile (created just to test with), still has the same errors (meaning there isn't any extensions or stuff like that to interfere, as it is a raw profile I tested with)
xxxterm also hangs at 100% - I don't know how to access a console log for that one.
Obviously, I can't test with something like Internet Explorer, as that product is Windows exclusive...
Long story short, I have a hard time believing you can't find any bugs. I've copied them, and linked to sites that show them... Any sane browser should stop processing a JS file, at the first error it encounters. I'd point to the specific line/word that triggers the error, but you've made a huge unreadable mess of those JS files. Putting (almost) everything on a single line. No wonder you have trouble debugging it!
