What is Light Firefox?
Light Firefox is a light browser based on Mozilla source code. Many components are slimmed down, so it can start faster and use less memory. By default, Light can run along with Firefox. Both x86 and x64 builds are available.
The project seems to be no longer developed. Last version, 49rc, released in October 2016, can be still downloaded from SourceForge.
Light Firefox Screenshots
Light Firefox Features
Light Firefox information
Comments and Reviews
Said about Light Firefox as an alternative
Pretty lightweight. May have some features that are missing but for us who dont use those features this is a good alternative!