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FirefoxCSS-Store
A collection site of Firefox userchrome themes, mostly from FirefoxCSS Reddit community.
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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.
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splitbrowser
Split Browser - a minimalistic, ultra-lightweight, open source web browser based on WebKit/Ultralight/native webview with a split screen (tiled) view
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I don't really think anyone is copying anyone here. This is a popular feature for browsers that has been around for over a decade.
Orion[1] is another recent MacOS browser that released before Arc in 2021 and has vertical tabs. Edge had vertical tabs as an experiment back in 2020[2] and is full feature now. Vivaldi has had vertical tabs since 2015[3]. It might not count since it's not built in, but Firefox has had vertical tab extensions since 2007[4].
[1]https://browser.kagi.com/
[2] https://www.howtogeek.com/697986/how-to-enable-and-use-verti...
[3]https://www.maketecheasier.com/vertical-tabs-browsers/
[4]https://github.com/piroor/treestyletab/graphs/contributors
You can also remove that unnecessarily large sidebar header that Firefox insists on not letting users disable via normal means with userchrome mods. Some such setups can be seen at https://firefoxcss-store.github.io/.
https://github.com/microsoft/vscode/issues/108264#issuecomme...
IIRC, the background processes for these ad and crypto services still run in the background even when you disable them. I haven't checked the browser in a long while. But it's easily verifiable by opening the brave task manager.
Quick Google result: https://github.com/brave/brave-browser/issues/5429
Check out my Split Browser (https://github.com/niutech/splitbrowser), currently alpha.