A Chrome extension that allows you to mark elements of someone else's web page (in the browser), such as strikethrough text or change the color of a block?

Question

Google Chrome

Like in Ublock you can click on an element and select "Block" and then it will be hidden. But I would like the text to be crossed out or the div container to change color, or something so that when viewing this or that site, I would see what I marked on it earlier.

Answer 1

This can be done in the same uBlock Origin .
Read the cosmetic filters documentation .
For example, here is a rule for the Yandex Market, which recolors in yellow ad units (instead of a product card) with direct links to stores:

market.yandex.ru#$#article[data-autotest-id="offer-snippet"]{ background-color:#ff9 !important; }

Just in case, you can make a similar rule for regular product cards, which colors it in a subtle green, to notice when these rules suddenly break for some reason.

market.yandex.ru#$#article[data-autotest-id="product-snippet"]{ background-color:#efe !important; }

Answer 2

This is called notes, the Vivaldi browser can take notes out of the box, and it is quite possible to install special extensions on other browsers.