Add ConvertFlow domains to denylist

[ignoramous]

Issue Submit Form

Provide the following info properly, which will help me to resolve your issue quickly.

Issue(s):

Type x in between [ ] and make sure there isn't any space between brackets. Example; for Your Selected Issue(s), type like this - [x] You can select more than one category of issues if you need to!

• [ ] Whitelist
• [x] Blacklist
• [ ] App Broken
• [ ] Website Broken
• [ ] Request
• [ ] Other Issue

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Domain(s):

If you are submitting this issue for whitelist/blacklist issue, send me the domain(s) for whitelisting/blacklisting here. Kindly use the Code Tag to prevent tracking.

• Domain(s):

  
  convertflow.com
  customers.convertflow.com
  www.convertflow.com

convertflow.co js.convertflow.co img.convertflow.co uploads.convertflow.co app.convertflow.co

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### Details:
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- Your Issue Detail: 
`ConvertFlow` is a customer marketing platform. I stumbled upon it on `blog.close.com`.

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<!-- Just a description of the issue when you visit the site/use app/software. Or steps on reproducing this -->

[spirillen]

Thanks for sharing these founds @ignoramous :100: :trophy:

[anudeepND]

This is similar to #161, Convertflow has lot of elements like forms and sticky elements on the page, blocking it will break a lot of sites