diff --git a/firefox-redhat-default-prefs.js b/firefox-redhat-default-prefs.js
index 607a132..9ead3a2 100644
--- a/firefox-redhat-default-prefs.js
+++ b/firefox-redhat-default-prefs.js
@@ -16,7 +16,7 @@ pref("extensions.shownSelectionUI",         true);
 pref("ui.SpellCheckerUnderlineStyle",       1);
 pref("startup.homepage_override_url",       "http://www.redhat.com");
 pref("startup.homepage_welcome_url",        "http://www.redhat.com");
-pref("browser.startup.homepage",            "data:text/plain,browser.startup.homepage=file:///usr/share/doc/HTML/index.html");
+pref("browser.startup.homepage",            "data:text/plain,browser.startup.homepage=file:///%PREFIX%/share/doc/HTML/index.html");
 pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
 pref("media.gmp-gmpopenh264.provider.enabled",false);
 pref("media.gmp-gmpopenh264.autoupdate",false);
diff --git a/firefox.spec b/firefox.spec
index 2b29339..6859440 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -124,7 +124,7 @@
 
 #%global default_bookmarks_file  %{_datadir}/bookmarks/default-bookmarks.html
 # need to use full path because of flatpak where datadir is /app/share
-%global default_bookmarks_file  /usr/share/bookmarks/default-bookmarks.html
+%global default_bookmarks_file  %{_prefix}/share/bookmarks/default-bookmarks.html
 %global firefox_app_id  \{ec8030f7-c20a-464f-9b0e-13a3a9e97384\}
 # Minimal required versions
 %global cairo_version 1.13.1
@@ -1418,6 +1418,7 @@ create_default_langpack "zh-TW" "zh"
 ln -s %{mozappdir}/defaults/preferences $RPM_BUILD_ROOT/%{mozappdir}/browser/defaults/preferences
 # Default preferences
 %{__cp} %{SOURCE12} %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
+sed -i -e 's|%PREFIX%|%{_prefix}|' %{buildroot}%{mozappdir}/defaults/preferences/all-redhat.js
 
 # System config dir
 %{__mkdir_p} %{buildroot}/%{_sysconfdir}/%{name}/pref