Auto Reload by Yurii Zolot'ko

THIS EXTENSION WON'T BE MIGRATED TO FF57.

WebExtensions do not have access to file system so this extension (as many others now) is absolutely impossible to replicate as WebExtension.

See https://www.change.org/p/mozilla-save-mozilla-firefox-s-best-feature/u/21870109 for workarounds.

Another similar tools:
https://addons.mozilla.org/en-US/firefox/addon/live-reload/
https://chrome.google.com/webstore/detail/netbeans-connector/hafdlehgocfcodbgjnpecfajgkeejnaa
https://pypi.python.org/pypi/django-autoreloader

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Automatically reloads matching tabs when selected local files change (useful for web developers).

Also can automatically reload file:// tabs when underlying local files change.

Available Javascript reload code replacements:
$FILE - path to local file
$MTIME - file last modification time
Example:
var file = '$FILE';
var mtime = '$MTIME';
alert(file + ' was modified at' + mtime);
Advanced settings (via about:config):
"extensions.autoreload.filter" - custom file filter applied when adding/watching folders.
Example: "(py|html|js|css)$"