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