phi-for-vivaldi/Lo-Phi/README.md
2026-05-16 00:28:36 +02:00

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# <img src="../icons/phi.svg" width="32" height="32"> Lo-Phi (/'loʊ,faɪ/)
Lo-Fi variant of Phi, the ultimate vertical experience theme for Vivaldi, made with attention to details.
| ![](./screenshots/1_linux.webp) | ![](./screenshots/2_mac.webp) |
|---------------------------------|-------------------------------|
## :sparkles: Features
- Supported Vivaldi features : UI auto-hide, UI on left & right sides, theming from [themes.vivaldi.net](https://themes.vivaldi.net), toggle UI, panels, popups, split tabs ;
- Enhanced Vivaldi features :
- Stacked tabs : displayed inline with titles (optional, enabled by default) ;
- Pinned tabs : displayed as icon-only grid.
## :gear: Installation
1. Create a folder to download the mod into ;
2. Download the mod by right-clicking [here](https://git.kaki87.net/KaKi87/phi-for-vivaldi/raw/branch/master/Lo-Phi/Lo-Phi.css) then "Save Link As..." to the folder created in step 1 ;
3. Go to `vivaldi:flags` and next to "Allow CSS modifications", switch "Default" to "Enabled" ;
4. Open Vivaldi settings ;
- (Optionally) Under "Appearance" ➔ "Window Appearance" ➔ "Status Bar", select "Status Info Overlay" ;
- Under "Appearance" ➔ "UI Auto-Hide", check "Enable UI Auto-hide" (and optionally uncheck "Tab Bar") ;
- Under "Appearance" ➔ "Custom UI Modifications", open the folder created in step 1 ;
- Under "Tabs" ➔ "Tabs" ➔ "Tab Bar Position", select "Left" or "Right" ;
- Under "Tabs" ➔ "Tab Features" ➔ "Tab Stacking", select "Compact" ;
- Under "Panel" ➔ "Panel Position", select "Left" or "Right" (preferably the opposite of "Tab Bar Position") ;
- (Optionally) Under "Address Bar" ➔ "Extension Visibility", check "Expand Hidden Extensions to Drop-Down Menu" ;
5. Quit and relaunch Vivaldi ;
6. Start tweaking the UI ;
- Right-click anywhere on the UI then "Customize Toolbar..." ;
- Move whatever you want (probably the navigation buttons, address bar and extensions) into the sidebar, before clicking "Done" ;
7. (Optionally) Star the [GitHub repo](https://github.com/KaKi87/phi-for-vivaldi) ;
8. Subscribe to Theo.
## :wrench: Troubleshooting
- Double check Vivaldi settings as per installation step 4 ;
- Find potentially incompatible settings by comparing with an empty profile ;
- You may disable Phi by setting the tab bar position to top or bottom or toggling the tab bar off ;
- Simultaneously using Phi with another CSS mod is not supported.
## :handshake: Feedback & Support
- [Issues](https://git.kaki87.net/KaKi87/phi-for-vivaldi/issues)
- [GitHub Issues](https://github.com/KaKi87/phi-for-vivaldi/issues)
- [Discord](https://discord.gg/pdgQE6juqM)
- [Reddit](https://old.reddit.com/r/vivaldibrowser/comments/1ieyt5a/)
- [Vivaldi forum](https://forum.vivaldi.net/topic/105134/%CF%86-phi-the-ultimate-vertical-experience-theme-for-vivaldi-made-with-attention-to-details)
## 🛜 Why "Phi" ?
Phi (φ) is a greek letter, used (among other things) to designate angles, like (for example) [sextant](https://en.wikipedia.org/wiki/Sextant) (<a href="https://en.wikipedia.org/wiki/Arc_(web_browser)" target="_blank"><img src="../icons/arc.svg" width="32" height="32"></a>) & [compass](https://en.wikipedia.org/wiki/Compass) (<a href="https://en.wikipedia.org/wiki/Safari_(web_browser)" target="_blank"><img src="../icons/safari.svg" width="32" height="32"></a>) measurements for *navigation*.
This specific version, Lo-Phi, is named after the "Lo-Fi" music style, which initially stands for "low fidelity", as opposed to "Hi-Fi" which stands for "high fidelity".
Lo-Phi is indeed a "low-fidelity" variant of Phi, as it contains much less features, while also freed from the constraints of the original, like limited auto-hide support, and on Mac, limited right-side UI support.
---
© 2026 — KaKi87<br>
Released under the [MIT license](https://opensource.org/license/mit).