Inject javascript to the webpage you are visiting
Javascript Injector Extension
For example, if you want to change the background color of https://duckduckgo.com/ with light blue, you can inject the script 'document.body.style.backgroundColor = \"lightblue\";' using this extension. After that every time you open this web site, the back ground will be light blue automatically.
Source Manifest.json
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User reviews
D_00 (ID: 000000d6f72f5e7f) Voted 3 ★ - Updated 04/24/2022
Valen Valenzaa (ID: 0000001204a61269) Voted 5 ★ - Updated 03/08/2022
Ivan Pruchai (ID: 00000041e58b2695) Voted 4 ★ - Updated 02/04/2020
Yassine Safraoui (ID: 000000a14df3303b) Voted 5 ★ - Updated 08/02/2019
Steve Wood (ID: 00000009014a000e) Voted 5 ★ - Updated 01/02/2019