Congratulations! bibtexbrowser is correctly installed!
Now you have to pass the name of the bibtex file as parameter (e.g. bibtexbrowser.php?bib=mybib.php)
You may browse:
Fatal error: Uncaught Error: Call to a member function multisearch() on null in /var/www/html/bibtexbrowser.php:2975
Stack trace:
#0 /var/www/html/bibtexbrowser.php(3106): Dispatcher->Dispatcher()
#1 {main}
thrown in /var/www/html/bibtexbrowser.php on line 2975