What is the plugin location for Firefox Nightly 64-bit?
On Fedora 25 64-bit Linux, my local install of Firefox Nightly 64-bit wasn't finding the Flash plugin which I installed with `sudo dnf install . But the system Firefox finds it fine by reading the directory /usr/lib64/mozilla/plugins, which has a symlink to /usr/lib64/flash-plugin/libflashplayer.so.
I confirmed using `strace` that Firefox Nightly does not search this directory but Fedora's system Firefox does search it, maybe because HAVE_USR_LIB64_DIR is not defined for Nightly. The Chosen Solution for the archived thread "Where do I put libflashplayer.so for linux?", https://support.mozilla.org/en-US/questions/1030381?fpa=1 , says to put it in /usr/lib64/firefox/browser/plugins/ , but Nightly doesn't search that directory either.
I solved this by creating a symlink to the system's libflashplayer.so in ~/.mozilla/plugins:
ln -s /usr/lib64/flash-plugin/libflashplayer.so ~/.mozilla/plugins
Can someone update that archived thread to give this solution for Nightly or at least mention it doesn't work for Nightly?
FYI I updated the Linux section of https://developer.mozilla.org/en-US/docs/Plugins/Guide/Plug-in_Basics?document_saved=true#How_Gecko_Finds_Plug-ins . It still has some garbled developer verbiage in it..