Update a google Chrome extension for Facebook video Grabber

my extension for facebook video grabber is by adding some buttons on Facebook videos to get the direct video url the extension is working fine but when still using the script for some times on facebook it change the the direct video download url by adding in the Urls these numbers (u2500) and when i replace it with (%) the video working fine for example : the broken video url : [login to view URL]://[login to view URL]\u00253AAeFfHvtRffC_0TGgk6yCSKsvBKD49Vfqu9KpyHx6hd3ha87G6LLOlhN83qRLCSbuRit96c30QzipnvQyaLvM5mrMZFfIOf-XoTPV3K9zazKCNg&oh=6fa7d84d44dbe97ae576d3dd74e4fda5&oe=5AC2C438 After changing the url by removing \u0025 and add % instead it: [login to view URL]://[login to view URL] i want to make the script doing this replacement auto if found \u0025 or u0025 to be %