I don't remember any problems before.
The Error console mentions PureURL. (see below) so I disabled that and restarted the browser. Still no luck.
My backup browser, Librewolf fared even worse, and was struggling to play anything at all, let alone in full screen mode.
Here is the video in question if you want to try yourselves.
https://www.dailymotion.com/video/x8b253q
EDIT.
The error console output with pureurl disabled is:
Code: Select all
Timestamp: 24/05/22 15:54:19
Error: TypeError: aPopupMenu.triggerNode is null
Source File: chrome://browser/content/browser.js
Line: 13836
Code: Select all
Timestamp: 24/05/22 15:43:54
Error: [PureURL error:] URI= https://sb.scorecardresearch.com/p?c1=19&c2=4000005&ns_ap_an=unknown&ns_ap_pn=js&ns_ap_pv=5&c12=_&name=foreground&ns_ap_ec=1&ns_ap_ev=start&ns_ap_device=Linux%20x86_64&ns_ap_id=1653403434098&ns_ap_csf=1&ns_ap_bi=unknown&ns_ap_pfm=webbrowser&ns_ap_pfv=Firefox%2052.0&ns_ap_ver=unknown&ns_ap_sv=7.6.0.210114&ns_ap_bv=7.6.0.210114&ns_ap_smv=6.4&ns_type=view&ns_ap_gs=1653403429096&ns_ts=1653403429094&ns_ap_cfg=1110101-110-3C-7D0-A-1F-1E-1E-12C-A&ns_ap_env=0-0-2&ns_ap_ut=60000&ns_ap_ar=unknown&ns_ap_cs=1&ns_ap_fg=1&ns_ap_dft=0&ns_ap_dbt=0&ns_ap_dit=0&ns_ap_as=1&ns_ap_das=0&ns_ap_usage=0&ns_radio=unknown&gdpr=1&gdpr_consent=&ns_ap_install=1653403429096&ns_ap_ft=0&ns_ap_bt=0&ns_ap_it=0&ns_ap_res=854x480&ns_ap_sd=1600x900&ns_ap_po=0x0&ns_ap_lang=en-US&ns_ap_jb=unknown&ns_c=UTF-8&c7=https%3A%2F%2Fwww.dailymotion.com%2Fembed%2Fvideo%2Fx8b253q&c8=Dailymotion%20Video%20Player&c9=https%3A%2F%2Fhdclump.com%2Fchelsea-flower-show-episode-3-2022%2F
modified path=/p?c1=19&c2=4000005&ns_ap_an=unknown&ns_ap_pn=js&ns_ap_pv=5&c12=_&ns_ap_ec=1&ns_ap_ev=start&ns_ap_device=Linux%20x86_64&ns_ap_id=1653403434098&ns_ap_csf=1&ns_ap_bi=unknown&ns_ap_pfm=webbrowser&ns_ap_pfv=Firefox%2052.0&ns_ap_ver=unknown&ns_ap_sv=7.6.0.210114&ns_ap_bv=7.6.0.210114&ns_ap_smv=6.4&ns_type=view&ns_ap_gs=1653403429096&ns_ts=1653403429094&ns_ap_cfg=1110101-110-3C-7D0-A-1F-1E-1E-12C-A&ns_ap_env=0-0-2&ns_ap_ut=60000&ns_ap_ar=unknown&ns_ap_cs=1&ns_ap_fg=1&ns_ap_dft=0&ns_ap_dbt=0&ns_ap_dit=0&ns_ap_as=1&ns_ap_das=0&ns_ap_usage=0&ns_radio=unknown&gdpr=1&gdpr_consent=&ns_ap_install=1653403429096&ns_ap_ft=0&ns_ap_bt=0&ns_ap_it=0&ns_ap_res=854x480&ns_ap_sd=1600x900&ns_ap_po=0x0&ns_ap_lang=en-US&ns_ap_jb=unknown&ns_c=UTF-8&c7=https%3A%2F%2Fwww.dailymotion.com%2Fembed%2Fvideo%2Fx8b253q&c8=Dailymotion%20Video%20Player&c9=https%3A%2F%2Fhdclump.com%2Fchelsea-flower-show-episode-3-2022%2F
[Exception... "Component returned failure code: 0x80004004 (NS_ERROR_ABORT) [nsIURI.path]" nsresult: "0x80004004 (NS_ERROR_ABORT)" location: "JS frame :: chrome://pureurl4pm/content/common.jsm :: observe :: line 292" data: no]
Source File: chrome://pureurl4pm/content/common.jsm
Line: 295