Install the browser extension Tampermonkey

Detect your browser type is

After Tampermonkey installed, you should see a new button on the browser navigate bar, like the image below. Go next if you have sew it.

Install Pxer

Make sure you have installed Tampermonkey, then click the button below for install Pxer

There is the result for install below

（Success! Click the "install" button for install）

（Fail, the browser open the source of Pxer. Maybe you haven't installed Tampermonkey correctly）

（Fail, the browser downloaded a file. Maybe you haven't installed Tampermonkey correctly）

Pxer install successful! Let's try is now !

You will see the Pxer panel in pages of pixiv.net.
Note that you saw button in Pxer only when the page is supported.