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Building from source:

• https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Source_Code/Downloading_Source_Archives?redirectlocale=en-US&redirectslug=Download_Mozilla_Source_Code
• https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions
• https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/Linux_Prerequisites

Unpack the mozilla source code and change into the mozilla-release directory. Create your own directory for this build, cd into it, then run ../configure.