_escaped_fragment_= URL Switcher is a developer tools chrome extension. it's a free extension , it has 26 active users since released its first version, it earns an average rating of 2.00 from 1 rated user, last update is 2241 days ago.
This app switches page to escaped fragment version. Quite simple :)
You could download the latest version crx file or older version files and install it.
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100% user give 2-star rating. Read reviews of _escaped_fragment_= url switcher
You could find more help information from _escaped_fragment_= url switcher support page.
You could send emails to publisher, or check publisher's website.
More about manifest_file of _escaped_fragment_= url switcher.
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Just looked into the code and wondered what a useless extension could be. Don't even bother.