Building debug version of FX with leackcheck - Mardak/tiles-dev GitHub Wiki
- goto source root and paste bellow options into .mozconfig
ac_add_options --enable-application=browser
ac_add_options --enable-debug
ac_add_options --enable-logrefcnt
ac_add_options --disable-optimize
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Then ./mach cobber; ./mach build
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Relevant MDN documentation links are here: