Severe memory leak when using some Websites in Safari with Adguard enabled


Beta Tester
2019 MacBook Pro 13", 8GB RAM
MacOS version: Catalina 10.16.6
Safari Version: 13.1.2

Hi, I have a problem using the Adguard Browser extensions for Safari. On certain websites, memory use of Safari goes through the roof within a few seconds, reaching multiple Gigabytes (4-5 GB). The browser then becomes unresponsive, and shows a warning at the top similar to "This website is using a lot of memory, close it to make your machine responsive again" (forgot the exact wording).

When I close the respective tab, memory use of Safari drops instantly, and the machine becomes responsive again.

This problem completely disappears when I disable AdGuard either via unchecking all Adguard-related boxes in Safari preferences, or by disabling AdGuard via the menu bar icon. AdGuard is the only extensions I use in Safari.

One website where this problem consistently appears repeatably is (for example,, one of Germany's main news websites.

Is this a known problem and is there any way to fix it?



Beta Tester
Ironically, I now saw that the same memory leak happens on this very page:

Adguard enabled:

Screenshot 2020-09-09 at 10.49.09.png

Adguard disabled:

Screenshot 2020-09-09 at 10.51.36.png

Any ideas?