I installed the add-on just fine on my machine. When I go to access the feature I get the following error:

Warning: main(gb.js): failed to open stream: No such file or directory in /roster/addons/gearbrowser/index.php on line 31

Fatal error: main(): Failed opening required 'gb.js' (include_path='') in /roster/addons/gearbrowser/index.php on line 31

I've taken a look and gb.js is present in the directory, which is what line 31 of index.php calls. I'm not sure what else to look for (although I haven't looked very deep yet). Has anyone else seen this and know of a quick fix?