Hlo Friends,
Can webpage extension effects the SEO?

Your question is vague. What's Webpage  Extension?

When creating your website, the choice of your domain extension, or TLD, is important as it can impact your SEO performances. ... Features like domain-level keyword and domain extension have a low correlation to search rankings, but they still have. And they are still in front of social metrics like Twitter "retweet"

They actually effect the webpage loading and too many extensions will definitely harm your bounce rate.