When installing as a restricted access user do not attempt to install over an installation in a restricted-access/shared location as this may destroy that installation. The browser should still function however.

When installing as a restricted-access user on a shared machine into a location that you can write to, there may still be negative side effects (default browser/other keys not being set correctly).

If you experience this, make sure you are using the newest version of Adblock or Adblock Plus. Older versions of Adblock may cause the Clear Private Data confirmation window to appear when Firefox 1.5 starts.If you disabled xpinstall in Firefox 1.0.x by unselecting the Allow Web sites to Install Software preference (changed in Firefox 1.5), go to about:config and set the xpinstall.enabled preference to true to re-enable installs.If this is not desirable, an empty file must be created in the following directory: Software Update will not work if Firefox 1.5 is installed to a location that you do not have write access to, since Software Update needs to replace or create files in this location. If Firefox 1.5 is installed on a multi-user system in a location which is not writable by users, Firefox must be run once by a privileged user.Here is some more information on configuring your firewall. Even when disabled, some firewalls deny access. If you deny access, you must go into the firewall's configuration program and re-allow access. It's important that you always grant Firefox access. Most firewalls will ask you whether to allow a program to connect to the Internet. Some firewall software may silently block Firefox from running.

If you find that your favorite Extension or Theme has not been updated to be compatible with this release of Firefox, write the author and encourage them to update it. This is because Firefox changes from release to release and as such the ways in which some extensions integrate changes, meaning there can be problems when running an older extension with a newer version of Firefox. When you install Firefox 1.5, your Extensions and Themes may be disabled until Firefox 1.5 determines that either a) they are compatible with the Firefox 1.5 release or b) there are newer versions available that are compatible. Please report any issues to the maintainer of the extension. Extensions installed under Firefox 1.0 may be incompatible and/or require updates to work with Firefox 1.5.

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