I've installed a third-party plug-in into phpBB3 that manipulates the output of the pages. That's what it's supposed to do, and that's why I installed it, but there's one small part of those manipulations that I need to get rid of.
The plug-in looks for the </title> tag in the HTML output and then adds an unwanted BASE tag right after it (by replacing </title> with </title><base href="http://www.example.com/" />).
You might think, why not just dig into the plug-in source and comment out that particular function? Well, that's the kicker: the plug-in is encoded with Zend Guard, so I can't make heads nor tails of its source, and unfortunately the developer is not willing to assist.
The only option I seem to have, then, is to install a hook, or customize phpBB is some other way, so that this particular change to phpBB's output is undone. Basically, the customization would have to remove the BASE tag after the plug-in has inserted it -- but since I want to be able to insert the BASE tag when and where I do want it, it should only remove it when it comes right after the </title> tag.
Further details will be shared via PM.