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diff --git a/toolkit/mozapps/extensions/content/extensions.js b/toolkit/mozapps/extensions/content/extensions.js
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--- a/toolkit/mozapps/extensions/content/extensions.js
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+++ b/toolkit/mozapps/extensions/content/extensions.js
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@@ -195,19 +195,25 @@ function loadView(aViewId) {
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gViewController.loadInitialView(aViewId);
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} else {
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gViewController.loadView(aViewId);
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}
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}
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function isCorrectlySigned(aAddon) {
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- // temporary add-ons do not require signing
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+ // Temporary add-ons do not require signing.
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if (aAddon.scope == AddonManager.SCOPE_TEMPORARY)
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return true;
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+ // On UNIX platforms except OSX, an additional location for system add-ons
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+ // exists in /usr/{lib,share}/mozilla/extensions. Add-ons installed there
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+ // do not require signing either.
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+ if (aAddon.scope == AddonManager.SCOPE_SYSTEM &&
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+ Services.appinfo.OS != "Darwin")
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+ return true;
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if (aAddon.signedState <= AddonManager.SIGNEDSTATE_MISSING)
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return false;
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return true;
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}
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function isDiscoverEnabled() {
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if (Services.prefs.getPrefType(PREF_DISCOVERURL) == Services.prefs.PREF_INVALID)
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return false;
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diff --git a/toolkit/mozapps/extensions/internal/XPIProvider.jsm b/toolkit/mozapps/extensions/internal/XPIProvider.jsm
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--- a/toolkit/mozapps/extensions/internal/XPIProvider.jsm
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+++ b/toolkit/mozapps/extensions/internal/XPIProvider.jsm
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@@ -682,18 +682,23 @@ function isUsableAddon(aAddon) {
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// Hack to ensure the default theme is always usable
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if (aAddon.type == "theme" && aAddon.internalName == XPIProvider.defaultSkin)
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return true;
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if (aAddon._installLocation.name == KEY_APP_SYSTEM_ADDONS &&
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aAddon.signedState != AddonManager.SIGNEDSTATE_SYSTEM) {
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return false;
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}
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- // temporary and system add-ons do not require signing
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- if ((aAddon._installLocation.name != KEY_APP_SYSTEM_DEFAULTS &&
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+ // Temporary and system add-ons do not require signing.
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+ // On UNIX platforms except OSX, an additional location for system add-ons
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+ // exists in /usr/{lib,share}/mozilla/extensions. Add-ons installed there
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+ // do not require signing either.
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+ if (((aAddon._installLocation.scope != AddonManager.SCOPE_SYSTEM ||
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+ Services.appinfo.OS == "Darwin") &&
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+ aAddon._installLocation.name != KEY_APP_SYSTEM_DEFAULTS &&
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aAddon._installLocation.name != KEY_APP_TEMPORARY) &&
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mustSign(aAddon.type)) {
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if (aAddon.signedState <= AddonManager.SIGNEDSTATE_MISSING)
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return false;
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}
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if (aAddon.blocklistState == Blocklist.STATE_BLOCKED)
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return false;
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