I asked for your WordPress admin credentials so that I can help you debug the issue that you are facing and I had no other intention. It is fairly common for plugin authors to request access information to debug plugin issues, especially with self-hosted WordPress installations. But I can understand if you are not willing to share that information.
Anyways I can give you some pointers which you can use to debug the issue.
- Check your PHP error log. See if there are any error entires
- Make sure you are using the latest version of WordPress and my plugin. Also talk to your host to see if they are using the latest version of PHP and Mysql.
- If possible try to activate the plugin from a different computer, network and browser. Did you tried it in Google Chrome?
- Also if possible send me the screenshot of your crashed browser.
Let me know the answers to the above questions and I can try my best to help you. But without access to your WordPress admin, I am not sure if I can do much.