If by "crashes" you mean that the window becomes unresponsive, please give it more time.
The architecture of the Marketplace window is not handling the large number of items available in the Marketplace very well (especially including the materials). Unfortunately this leads to the window being "unresponsive" to Windows, which makes it seem the application has crashed.
The red circle indicates that there are updates available for plugins you have installed. The number in the circle indicates how many plugins have updates available.
Clicking on the MarketPlace icon shouldn't crash Cura though. Maybe @nallath or another team member will address that.
I have found that the MarketPlace can take 30 seconds to load and populate its dialog box.
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