1
Also covers open source · same kind of open-source project
Sidebery manages Firefox tabs and bookmarks in a sidebar through a browser extension.
Alternatives
The Best Sine Alternatives in 2026
16 alternatives0 free · 16 open source
Looking for something like Sine? Here are 16 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 16 are open source.
Sine manages themes for Firefox-based browsers, according to its project description.
Top picks at a glance
First suggestionSideberySidebery manages Firefox tabs and bookmarks in a sidebar…Another optionAnoriAnori adds customizable new-tab pages to Chrome and…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Sidebery | — | Yes | — |
| 2 | Anori | — | Yes | — |
| 3 | Copy Selection as Markdown | — | Yes | Browser extension |
| 4 | Gesturefy | — | Yes | — |
| 5 | Firefox CSS Hacks | — | Yes | Linux, Windows |
| 6 | Dark Background and Light Text | — | Yes | Browser extension |
| 7 | Newtaboverride | — | Yes | Browser extension |
| 8 | Auto-Sort Bookmarks | — | Yes | Browser extension |
| 9 | Betterfox | — | Yes | — |
| 10 | Adaptive Tab Bar Colour | — | Yes | macOS |
All Sine alternatives
2
Also covers open source · same kind of open-source project
Anori adds customizable new-tab pages to Chrome and Firefox, with widgets for bookmarks, calendar, to-do items, and notes.
3
Also covers open source · same kind of open-source project
Copy Selection as Markdown copies a page title, URL, and selected text as Markdown through a Firefox add-on.
4
Also covers open source · same kind of open-source project
Mouse gestures and browser commands are available through Gesturefy, a customizable Firefox add-on designed for mice, not touchpads.
5
Also covers open source · same kind of open-source project
Firefox CSS Hacks collects user stylesheets for changing the appearance of Mozilla Firefox.
6
Also covers open source · same kind of open-source project
Dark Background and Light Text changes webpage colors to show light text on a dark background through a Firefox add-on.
7
Also covers open source · same kind of open-source project
New Tab Override lets Firefox users choose which page appears whenever they open a new tab.
8
Also covers open source · same kind of open-source project
Auto-Sort Bookmarks sorts Firefox bookmarks by multiple criteria, with settings for automatic sorting.
9
Also covers open source · same kind of open-source project
Betterfox provides Firefox about:config preference tweaks and user.js settings intended to adjust privacy, security, and performance.
10
Also covers open source · same kind of open-source project
Adaptive Tab Bar Colour changes the Firefox theme color to match the appearance of the current website.
11
Also covers open source · same kind of open-source project
Firefox Scripts provides userChromeJS, autoconfig.js, and extension scripts, with installation instructions for Firefox Developer Edition.
12
Also covers open source · same kind of open-source project
TablissNG offers a customizable new-tab page for Firefox, Chrome, and Edge, maintained as a version of the Tabliss project.
13
Also covers open source · same kind of open-source project
Bookmarks Organizer finds bookmarks that no longer work and helps users put their saved links in order.
14
Also covers open source · same kind of open-source project
This browser extension downloads books from Internet Archive and HathiTrust Digital Library, with a notice naming its official source.
15
Also covers open source · same kind of open-source project
BetterViewer replaces the built-in image viewing mode in Firefox and Chrome-based browsers.
16
Also covers open source
Dark Reader is an open-source MIT-licensed browser extension for Chrome and Firefox that analyzes web pages and generates a dark mode to reduce eyestrain.
No alternatives match this filter.
Alternatives to similar tools
Copy Selection as Markdown24 alternativesBookmarks Organizer24 alternativesAnori24 alternativesAuto-Sort Bookmarks24 alternativesAdaptive Tab Bar Colour20 alternativesFirefox Scripts24 alternatives
What is the best alternative to Sine?
Based on features, tags and platforms, the closest alternatives to Sine are Sidebery, Anori, and Copy Selection as Markdown.
Are there open-source alternatives to Sine?
Yes: Sidebery, Anori, Copy Selection as Markdown, and Gesturefy.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative