Companion Window Not working

[neco-a]

I wanted to use it on a search page on Comet (browser) and it is giving this issue:
data:text/html,%3C!DOCTYPE%20html%3E%3Chtml%3E%3Cbody%3E%3Cscript%3Ealert(%22Seems%20like%20Companion%20Window%20was%20just%20installed%20or%20updated.%20Please%20reload%20the%20tab%20or%20restart%20your%20browser.%22)%3Bwindow.close()%3B%3C%2Fscript%3E%3C%2Fbody%3E%3C%2Fhtml%3E