As early as last December, after Microsoft's edge plug-in store went online for the first time, about 160 extensions went online. Since then, the number has been growing. By March, the number of expansion has exceeded 1000.However, not all extensions are well intentioned. In April, developers of popular dark mode extensions published a blog post to remind users of malicious extensions with the same name published on the edge plug-in store.
The developer also confirmed that similar plug-ins with malicious behavior also occur on chrome and Firefox. However, both Mozilla and Microsoft have removed these malicious extensions, but users still need to check whether they are using the right extensions.
To further improve quality, Microsoft recently added user ratings and comments to the edge plug-in store, so it's best to read these before downloading and installing new extensions.