Updated September 2026

Most customizable browsers in 2026

From rearranging every toolbar to rewriting the interface in CSS or a real programming language. This list rewards browsers that let you reshape how they look and work, not just pick an accent color.

1. 1

   Vivaldi

   97%

   The power user's toolbox.

   Blink partially open WindowsmacOSLinuxAndroidiOS
   Customization 3/3Built-in tools 3/3Extension ecosystem 3/3

   Worth knowing: Can feel heavy and busy until tamed

2. 2

   Floorp

   92%

   Firefox with every switch exposed.

   Gecko open source WindowsmacOSLinux
   Customization 3/3Built-in tools 2/3Extension ecosystem 3/3

   Worth knowing: So many options it can overwhelm

3. =3

   Opera

   76%

   The feature-packed veteran.

   Blink proprietary WindowsmacOSLinuxAndroidiOS
   Customization 2/3Built-in tools 3/3Extension ecosystem 2/3

   Worth knowing: Owned by a Chinese consortium — a trust question for some

4. =3

   Whale

   76%

   Naver's dual-screen powerhouse.

   Blink proprietary WindowsmacOSAndroidiOS
   Customization 2/3Built-in tools 3/3Extension ecosystem 2/3

   Worth knowing: Korea-centric services and account

5. =3

   Zen Browser

   76%

   Calm, beautiful Firefox.

   Gecko open source WindowsmacOSLinux
   Customization 2/3Built-in tools 2/3Extension ecosystem 3/3

   Worth knowing: Young, fast-moving project — occasional rough edges

6. 6

   Firefox

   73%

   The independent original.

   Gecko open source WindowsmacOSLinuxAndroidiOS
   Customization 2/3Built-in tools 1/3Extension ecosystem 3/3

   Worth knowing: Mozilla's ad-tech experiments irritate purists

7. 7

   Opera GX

   71%

   The browser that thinks it's a gaming rig.

   Blink proprietary WindowsmacOSAndroidiOS
   Customization 2/3Built-in tools 2/3Extension ecosystem 2/3

   Worth knowing: The aesthetic is… a lot

8. 8

   Waterfox

   65%

   Privacy-tuned Firefox with a gentler touch.

   Gecko open source WindowsmacOSLinuxAndroid
   Customization 2/3Built-in tools 0/3Extension ecosystem 3/3

   Worth knowing: Small team — updates can trail Firefox slightly

9. 9

   Iceraven

   63%

   Firefox for Android, unleashed.

   Gecko open source Android
   Customization 2/3Built-in tools 0/3Extension ecosystem 3/3

   Worth knowing: Sideload/Obtainium updates

10. 10

    Pale Moon

    60%

    The classic Firefox that never left.

    Goanna open source WindowsLinux
    Customization 3/3Built-in tools 0/3Extension ecosystem 1/3

    Worth knowing: Some modern sites break on Goanna