You need to modify the webviewer useragent by removing ; wv from it.
There are a variety of extensions available to do this. Oddly I am just in the middle of working on a new one.
You can try CustomWebView or WebViewTools
search here:
Extension Links
Taifun
Puravidaapps
Lost Extensions 1
Inactive Communities
Lost Extensions 2
Thunkable/Others