It really seemed that Firefox 150 affected Youtube, notably for Japanese vidoes. Even Private Window didn't help.
Not sure whether it's related to Unicode or non-English Youtube links.
On 4/28/2026 12:49 PM, Mr. Man-wai Chang wrote:
It really seemed that Firefox 150 affected Youtube, notably for Japanese
vidoes. Even Private Window didn't help.
Not sure whether it's related to Unicode or non-English Youtube links.
The following 2 links should play the same video. However,
the first link didn't slow down Firefox, but the second
one caused Firefox to freeze.
In the 2nd URL, you could not even highlight and copy text
once the link started to load. The whole tab just freezed!
Both links feature Japanese text.
pCEpeope<pae25oa?o||pCau#+o+Y*-apCUtof*|2pUooeaoiOueCpU<paLpe|peAoLooCAN+Uuyato+pCApeope<paeN+i*|a*a+oecuea
E|eN+ipCA25o||pU|peepU<peope>pe+paopa|pe+pa+pa| - YouTube <https://www.youtube.com/watch?v=qW2sE3P9TJU>
pCEE+<oYopa-penpaCpa+peope<paepCape!pa4pUfu#+o+Y*-apUiu!opU+peepU-pUarCaoeaoiOueCoaapUoonouU|peipU<peope>
pe+paopa|pe+pa+pa|*outaUN+UpCCpCApeope<paepa+*|a*a+r+AueaE|epa+pCAuL4t+?uyaoaA - YouTube
<https://www.youtube.com/watch?v=9nlbaIIgyWE>
Both links feature Japanese text.
pCEpeope<pae25oa?o||pCau#+o+Y*-apCUtof*|2pUooeaoiOueCpU<paLpe|peAoLooCAN+Uuyato+pCApeope<paeN+i*|a*a+oecuea
E|eN+ipCA25o||pU|peepU<peope>pe+paopa|pe+pa+pa| - YouTube <https://www.youtube.com/watch?v=qW2sE3P9TJU>
pCEE+<oYopa-penpaCpa+peope<paepCape!pa4pUfu#+o+Y*-apUiu!opU+peepU-pUarCaoeaoiOueCoaapUoonouU|peipU<peope>
pe+paopa|pe+pa+pa|*outaUN+UpCCpCApeope<paepa+*|a*a+r+AueaE|epa+pCAuL4t+?uyaoaA - YouTube
<https://www.youtube.com/watch?v=9nlbaIIgyWE>
On 4/28/2026 12:49 PM, Mr. Man-wai Chang wrote:
It really seemed that Firefox 150 affected Youtube, notably for Japanese
vidoes. Even Private Window didn't help.
Not sure whether it's related to Unicode or non-English Youtube links.
The following 2 links should play the same video. However,
the first link didn't slow down Firefox, but the second
one caused Firefox to freeze.
In the 2nd URL, you could not even highlight and copy text
once the link started to load. The whole tab just freezed!
Both links feature Japanese text.
pCEpeope<pae25oa?o||pCau#+o+Y*-apCUtof*|2pUooeaoiOueCpU<paLpe|peAoLooCAN+Uuyato+pCApeope<paeN+i*|a*a+oecueaE|eN+ipCA25o||pU|peepU<peope>pe+paopa|pe+pa+pa|
- YouTube
<https://www.youtube.com/watch?v=qW2sE3P9TJU>
pCEE+<oYopa-penpaCpa+peope<paepCape!pa4pUfu#+o+Y*-apUiu!opU+peepU-pUarCaoeaoiOueCoaapUoonouU|peipU<peope>pe+paopa|pe+pa+pa|*outaUN+UpCCpCApeope<paepa+*|a*a+r+AueaE|epa+pCAuL4t+?uyaoaA
- YouTube
<https://www.youtube.com/watch?v=9nlbaIIgyWE>
Both links work perfectly with Fx 150.0 and Linux Mint 22.3
In the 2nd URL, you could not even highlight and copy text
once the link started to load. The whole tab just freezed!
<https://www.youtube.com/watch?v=9nlbaIIgyWE>
Both links work perfectly with Fx 150.0 and Linux Mint 22.3
That second one works for 140.9.0esr under Linux - the problem is not
some Youtube change which happened to coincide with the release of FF 150.
On 4/28/2026 5:53 PM, Jeff Layman wrote:
In the 2nd URL, you could not even highlight and copy text
once the link started to load. The whole tab just freezed!
<https://www.youtube.com/watch?v=9nlbaIIgyWE>
Both links work perfectly with Fx 150.0 and Linux Mint 22.3
If go about:config and set devtools.responsive.userAgent to "Linux" in
my Firefox for Windows, it worked flawlessly!!
That's one epic funny solution!! :)
On 4/28/2026 6:10 PM, Mr. Man-wai Chang wrote:
On 4/28/2026 5:53 PM, Jeff Layman wrote:
In the 2nd URL, you could not even highlight and copy text
once the link started to load. The whole tab just freezed!
<https://www.youtube.com/watch?v=9nlbaIIgyWE>
Both links work perfectly with Fx 150.0 and Linux Mint 22.3
If go about:config and set devtools.responsive.userAgent to "Linux" in
my Firefox for Windows, it worked flawlessly!!
That's one epic funny solution!! :)
But... but after restarting Firefox, the freeze came back!
Very strange! Has the pref in about:config changed back from "Linux", or
is it still the same?
Out of interest, what is meant to be the difference between those two
YouTube links?They seem identical when played.
Very strange! Has the pref in about:config changed back from "Linux", or
is it still the same?
Out of interest, what is meant to be the difference between those two
YouTube links?They seem identical when played.
I created a new profile (keeping only places.sqlite and chrome) and the
2nd YouTube (Oricon) link no longer freezed the tab. I then added back
all extensions, re-customized parameters in about:config, still no
freeze happened. It's really strange...
Okay, I could narrow it down to prefs.js, something to do with disabling telemetry settings possibly.
On 4/28/2026 5:53 PM, Jeff Layman wrote:
I am on Windows 10.
Both links work perfectly with Fx 150.0 and Linux Mint 22.3
On Tue, 28 Apr 2026 18:07:29 +0800, Mr. Man-wai Chang wrote:
On 4/28/2026 5:53 PM, Jeff Layman wrote:
I am on Windows 10.
Both links work perfectly with Fx 150.0 and Linux Mint 22.3
ThererCOs your problem, right there.
| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
| Users: | 65 |
| Nodes: | 6 (0 / 6) |
| Uptime: | 01:52:24 |
| Calls: | 862 |
| Files: | 1,311 |
| D/L today: |
10 files (20,373K bytes) |
| Messages: | 264,321 |