The other option is to `chown` the package directory, and Nightly will handle auto-updating. I only run on a 1 Mbit connection and I hardly notice when Nightly chooses to download the update on my Arch box, even while I'm actively browsing.
> its a 60MB update daily
The entire binary is ~32-33MB...I've never received an update that large.
Version : 25.0a1-1
Description : Standalone web browser from mozilla.org, nightly build
Architecture : x86_64
URL : http://www.mozilla.org/projects/firefox
Licenses : MPL GPL LGPL
Groups : None
Provides : None
Depends On : alsa-lib libxt libnotify mime-types nss gtk2 sqlite dbus-glib
Optional Deps : None
Required By : None
Optional For : None
Conflicts With : None
Replaces : None
Installed Size : 71562.00 KiB
Packager : Unknown Packager
Build Date : Wed 26 Jun 2013 08:31:12 AM EDT
Install Date : Wed 26 Jun 2013 08:31:51 AM EDT
Install Reason : Explicitly installed
Install Script : No
Validated By : None
The AUR nightly package on Arch is 71mb. It installs:
firefox-nightly /opt/firefox-25.0a1/ firefox-nightly /opt/firefox-25.0a1/Throbber-small.gif firefox-nightly /opt/firefox-25.0a1/application.ini firefox-nightly /opt/firefox-25.0a1/browser/ firefox-nightly /opt/firefox-25.0a1/browser/blocklist.xml firefox-nightly /opt/firefox-25.0a1/browser/chrome.manifest firefox-nightly /opt/firefox-25.0a1/browser/chrome/ firefox-nightly /opt/firefox-25.0a1/browser/chrome/icons/ firefox-nightly /opt/firefox-25.0a1/browser/chrome/icons/default/ firefox-nightly /opt/firefox-25.0a1/browser/chrome/icons/default/default16.png firefox-nightly /opt/firefox-25.0a1/browser/chrome/icons/default/default32.png firefox-nightly /opt/firefox-25.0a1/browser/chrome/icons/default/default48.png firefox-nightly /opt/firefox-25.0a1/browser/components/ firefox-nightly /opt/firefox-25.0a1/browser/components/components.manifest firefox-nightly /opt/firefox-25.0a1/browser/components/libbrowsercomps.so firefox-nightly /opt/firefox-25.0a1/browser/crashreporter-override.ini firefox-nightly /opt/firefox-25.0a1/browser/extensions/ firefox-nightly /opt/firefox-25.0a1/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/ firefox-nightly /opt/firefox-25.0a1/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/icon.png firefox-nightly /opt/firefox-25.0a1/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/install.rdf firefox-nightly /opt/firefox-25.0a1/browser/icons/ firefox-nightly /opt/firefox-25.0a1/browser/icons/mozicon128.png firefox-nightly /opt/firefox-25.0a1/browser/omni.ja firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/ firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/amazondotcom.xml firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/bing.xml firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/eBay.xml firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/google.xml firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/twitter.xml firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/wikipedia.xml firefox-nightly /opt/firefox-25.0a1/browser/searchplugins/yahoo.xml firefox-nightly /opt/firefox-25.0a1/chrome.manifest firefox-nightly /opt/firefox-25.0a1/components/ firefox-nightly /opt/firefox-25.0a1/components/components.manifest firefox-nightly /opt/firefox-25.0a1/components/libdbusservice.so firefox-nightly /opt/firefox-25.0a1/components/libmozgnome.so firefox-nightly /opt/firefox-25.0a1/crashreporter firefox-nightly /opt/firefox-25.0a1/crashreporter.ini firefox-nightly /opt/firefox-25.0a1/defaults/ firefox-nightly /opt/firefox-25.0a1/defaults/pref/ firefox-nightly /opt/firefox-25.0a1/defaults/pref/channel-prefs.js firefox-nightly /opt/firefox-25.0a1/dependentlibs.list firefox-nightly /opt/firefox-25.0a1/dictionaries/ firefox-nightly /opt/firefox-25.0a1/dictionaries/en-US.aff firefox-nightly /opt/firefox-25.0a1/dictionaries/en-US.dic firefox-nightly /opt/firefox-25.0a1/firefox firefox-nightly /opt/firefox-25.0a1/firefox-bin firefox-nightly /opt/firefox-25.0a1/icons/ firefox-nightly /opt/firefox-25.0a1/icons/updater.png firefox-nightly /opt/firefox-25.0a1/libfreebl3.chk firefox-nightly /opt/firefox-25.0a1/libfreebl3.so firefox-nightly /opt/firefox-25.0a1/libmozalloc.so firefox-nightly /opt/firefox-25.0a1/libmozsqlite3.so firefox-nightly /opt/firefox-25.0a1/libnspr4.so firefox-nightly /opt/firefox-25.0a1/libnss3.so firefox-nightly /opt/firefox-25.0a1/libnssckbi.so firefox-nightly /opt/firefox-25.0a1/libnssdbm3.chk firefox-nightly /opt/firefox-25.0a1/libnssdbm3.so firefox-nightly /opt/firefox-25.0a1/libnssutil3.so firefox-nightly /opt/firefox-25.0a1/libplc4.so firefox-nightly /opt/firefox-25.0a1/libplds4.so firefox-nightly /opt/firefox-25.0a1/libsmime3.so firefox-nightly /opt/firefox-25.0a1/libsoftokn3.chk firefox-nightly /opt/firefox-25.0a1/libsoftokn3.so firefox-nightly /opt/firefox-25.0a1/libssl3.so firefox-nightly /opt/firefox-25.0a1/libxul.so firefox-nightly /opt/firefox-25.0a1/mozilla-xremote-client firefox-nightly /opt/firefox-25.0a1/omni.ja firefox-nightly /opt/firefox-25.0a1/platform.ini firefox-nightly /opt/firefox-25.0a1/plugin-container firefox-nightly /opt/firefox-25.0a1/precomplete firefox-nightly /opt/firefox-25.0a1/removed-files firefox-nightly /opt/firefox-25.0a1/run-mozilla.sh firefox-nightly /opt/firefox-25.0a1/update-settings.ini firefox-nightly /opt/firefox-25.0a1/updater firefox-nightly /opt/firefox-25.0a1/updater.ini firefox-nightly /opt/firefox-25.0a1/webapprt-stub firefox-nightly /opt/firefox-25.0a1/webapprt/ firefox-nightly /opt/firefox-25.0a1/webapprt/omni.ja firefox-nightly /opt/firefox-25.0a1/webapprt/webapprt.ini firefox-nightly /usr/ firefox-nightly /usr/bin/ firefox-nightly /usr/bin/firefox-nightly firefox-nightly /usr/share/ firefox-nightly /usr/share/applications/ firefox-nightly /usr/share/applications/firefox-nightly-safe.desktop firefox-nightly /usr/share/applications/firefox-nightly.desktop firefox-nightly /usr/share/pixmaps/ firefox-nightly /usr/share/pixmaps/firefox-nightly-icon.png
And since it doesn't do incremental patch diffs in the pkgbuild it is a 70mb update every time. I'll try chowning /opt/firefox.