I'm a web developer.
I believe in the web. It trivializes information dispersal, a way to share free expression. Decentralization reduces the risk of censorship.
Many sites featuring perfectly fine content are saddled with poor design. I take every opportunity to make text readable and navigation simple.
RESTful APIs allow loose cooperation.
The extension facilities of web browsers bring a pipe dream of customization to fruition. This takes a default interface and augments it with expanded features or improved design. Developers can later incorporate concepts from popular extensions into their sites to respond to market demand and benefit the majority, who browse without extensions.