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Showing content from https://github.com/uBlockOrigin/uBlock-issues/issues/786 below:

Adsbygoogle.js injectable does not validate whether iframe going to be injected is already exist or not · Issue #786 · uBlockOrigin/uBlock-issues · GitHub

• I verified that this is not a filter issue
  • Filter issues MUST be reported at filter issue tracker
• This is not a support issue or a question
  • Support issues and questions are handled at /r/uBlockOrigin
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
  • Your issue may already be reported.
• I tried to reproduce the issue when...
  • uBlock Origin is the only extension
  • uBlock Origin with default lists/settings
  • using a new, unmodified browser profile
• I am running the latest version of uBlock Origin
• I checked the documentation to understand that the issue I report is not a normal behavior

Symptoms: Thousands of iframe created by ublock itself

What happened:

Some poorly written web page repeat

                <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
                <ins class="adsbygoogle" style="display:block" width-responsive="true"></ins>
                <script>(adsbygoogle = window.adsbygoogle || []).push({});</script>

everywhere instead of only the <ins> tag.

And ublock inject iframes everytime when you are loading the script

Possibly violating code: https://github.com/gorhill/uBlock/blob/caa8e7d35ba61214a9d13e7d324b2bd2aa73237f/src/web_accessible_resources/googlesyndication_adsbygoogle.js#L38-L46

It inject iframe without checking whether it already exist or not

https://www.esjzone.cc/detail/1563843171.html

1. Make a HTML,
2. Paste <ins class="adsbygoogle"/><script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> about 20 ~ 30 times
3. Open it with ublock installed

Nothing happened, as there is just several tags

Ublock inject thousands of iframes into the page, lag the page very seriously.
You won't even able to open the firefox console

• uBlock Origin version: 1.23.0
• Browser Name and version: Firefox 70~72
• Operating System and version: Android/Windows/Mac

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