When comparing Orion vs Firefox android, the Slant community recommends Firefox android for most people. In the question“What are the best mobile browsers ?” Firefox android is ranked 10th while Orion is ranked 12th. The most important reason people chose Firefox android is:
The built-in tracking protection can improve page load speed.
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Pros
Pro Plug-ins including Pixlr image editor
Pro Built for front-end development
Orion was developed specifically for front-end development, making it a strong option for front-end developers thanks to features like syntax validation with ESLint and HTML content assist.
Pro Eclipse-like UI
Orion is developed by Eclipse and shares a lot in common with the Eclipse IDE UI.
Pro Tracking protection
The built-in tracking protection can improve page load speed.
Pro Privacy focused
Pro Addons on mobile version
Supports addons like ublock-origin, privacy badger and many more like it's desktop counterpart
Pro Reader mode
Using reader mode on supported webpages improves reading experince
Cons
Con No runtime environment
Does mostly do file editing, but without good project support, web terminal, build/runtime environment.
Con JavaScript only
Orion currently only supports JavaScript.
Con Address bar at top
Having the address bar at the bottom helps in navigation on a big display