User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:65.0) Gecko/20100101 Firefox/65.0 Steps to reproduce: Unusual alert from browser console: [GFX1-]: shader-cache: Shader disk cache is not supported ERROR 2018-12-03T12:54:06Z: webrender_bindings::program_cache: shader-cache: Shader disk cache is not supported Actual results: Maybe related to Web render: [GFX1-]: shader-cache: Shader disk cache is not supported ERROR 2018-12-03T12:54:06Z: webrender_bindings::program_cache: shader-cache: Shader disk cache is not supported Expected results: No errors? Thanks

Hi, Thank you for the feedback and for taking the time to report this. The issue above is already discussed in Bug 1511726, please address any of your questions on that bug.