I'm trying to find a browser that combines several specific features I love from different ones, without the bloat or annoying dialogs. Here's what I'm looking for:

• Tab management like Zen Browser – vertical tabs, workspaces, auto-grouping, or similar efficient organization.
• No "Update Now" popups – I absolutely hate forced update dialogs that interrupt my workflow. A simple to no indicator are fine.
• Lightweight on system resources – low RAM/CPU usage, doesn't thrash the drive.
• Sync with mobile ( Optional ) – seamless bookmarks, passwords, open tabs across devices (Android/iOS).
• Search/address bar like Arc – slick, intuitive, with quick access to tabs/bookmarks/history (e.g., "Search in page", "Switch to tab").
• Not a typical Chrome clone – don't want the exact Chrome UI/UX. Can be Chromium-based but with heavy modifications (e.g., Vivaldi, Edge), or Firefox-based (I love Firefox's core). Just not "vanilla Chrome".
• No unnecessary features or ads – clean, no built-in bloatware, no sponsored content, no "news feed" or "shopping" features.
• Completely free – no freemium paywalls, no subscriptions. Open-source is a bonus.

I've tried: Zen (great tabs but still early, heavy-ish on RAM), Edge (lightweight but annoying update prompts and ads), Vivaldi (tons of options but feels bloated), Arc (good search**, but privacy concerns**, and has some proprietary stuff). Firefox is great but tab management is basic without extensions.