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uc.css.js
A dark indigo CSS theme for Firefox and a large collection of privileged scripts to add new buttons, menus, and behaviors and eliminate nuisances. The theme is similar to other userChrome stylesheets, but it's intended for use with an autoconfig loader like fx-autoconfig, since it uses JavaScript to implement its more functional features.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Linux support is pretty good these days and it's just as customizable as Vivaldi. See this repo for an example: https://github.com/aminomancer/uc.css.js
Besides being a massive open-source project with many contributors, uBlock Origin's filters mostly use extended syntax (which AFAIK Vivaldi does not support), which entails scriptlet injection (injecting javascript into a webpage in order to do advanced blocking), redirect (neutering offending javascript on webpages with an empty script), and procedural cosmetic filtering (explained here: https://github.com/gorhill/uBlock/wiki/Procedural-cosmetic-filters).