ぶら。

Free Japanese tabbed browser by zzZ on the Internet Explorer component, focused on speed: rarely used features moved to plugins, one of the first Japanese pop-up blockers, URL-based content blocking, a single-key “key mode”, cross-wise navigation between links, MDI; known for its naughty icons (a “safe” version existed), source code released in 2010.

Facts

Developer

zzZ (independent developer)

Website

web.archive.org

Engine

Trident

Platforms

Windows

Details

Windows XP; alpha1 (Feb. 2002), 1.0.00 (Aug. 2006), 1.2.04 and 1.3.00 beta 5 (Nov. 29, 2007); source released on Apr. 29, 2010

Popularity

35/100 — Estimate: niche 2000s freeware, ≈10k users

Key versions

1. Feb. 8, 2002
   alpha1TridentDevelopment begins of an IE-based tabbed browser focused on speed.
2. Mar. 30, 2002
   beta1First beta.
3. Aug. 19, 2006
   1.0.00Version 1.0.00 final.
4. Nov. 29, 2007
   1.2.04Last version, released alongside 1.3.00 beta 5.
5. Apr. 29, 2010
   —Source code of versions 1.2.04 and 1.3.00 beta 5 published.

Version sources: ぶら。 (Wikipedia ja)

Sources

1. https://ja.wikipedia.org/wiki/ぶら。
2. https://web.archive.org/web/20080131064724/http://www.geocities.jp/tabbrowser/feature/