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Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically

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  Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically Rh Kramer <rhkramer.s31@gmail.com> - 2020-06-21 23:00 +0200
    Re: Firefox shrinks to horizontal bar when viewing youtube video and  scrolling vertically Dan Ritter <dsr@randomstring.org> - 2020-06-22 14:30 +0200
      Re: Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically rhkramer@gmail.com - 2020-06-22 17:10 +0200
        Re: Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically rhkramer@gmail.com - 2020-06-22 18:50 +0200
          Resolved: Re: Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically rhkramer@gmail.com - 2020-06-23 03:50 +0200

#223852 — Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically

Aside: emailing from a different computer -- "Reply to:" will get to the right 
computer.  (I decided to use pasteboard, didn't wait for a better suggestion 
-- I hope the images are accessible.)

Problem with viewing Youtube videos on Firefox version 68.9.0 on Jessie (but 
not with the same version on Buster (well, at least so far): 

General statement of problem:

On Jessie (depending on circumstances, more below), if I move the vertical 
scrollbar at all, the video shrinks to a tiny bar near the upper right hand 
corner of the screen (see screenshots).  The only way I've found to undo the 
problem is to reload the page (and not touch the vertical scrollbar).

General statement of importance / criticality of the problem (to me):

I can live with this problem (aside: somewhat at least -- I was going to 
transition from my daily driver Wheezy system to the Jessie system, now I'm 
not so sure) (oh, I do plan to continue to use kmail on Wheezy for email (with 
mbox for email storage) -- too many problems on Jessie and Buster).  

The point of saying I can live with this is that I'm probably not going to put 
much effort into finding and solving the problem unless someone else has some 
experience with the same problem.  (I have googled, maybe with the wrong 
searchwords, but have not found anything of real relevance -- I did find some 
problems that mentioned scrolling but nothing like this.)

The problem in more detail, with screenshots:

Screenshots

My file name	link on pasteboard	discussion

ff_s31_postproblem.png       https://pasteboard.co/Jea4KeN.png	This shows the 
result of the problem -- notice the dark bar near the upper right hand corner 
-- the video has shrunk to that size after I've moved the vertical scroll bar 
even a very little bit.

ff_s31_noproblem.png          https://pasteboard.co/Jea2HO0.png	On my other 
computers, when I view a youtube video (without expanding it to full screen), 
I see this -- note the list of other videos in the column on the right hand 
side.

ff_s31_preproblem_b.png      https://pasteboard.co/Jea9W1Up.png		Most of the 
time when I view a youtube video on my Jessie system, it looks like either 
this or the next screenshot.  In this screenshot, notice the absence of the 
list of other videos to the right of the video.  If I move the vertical 
scrollbar, the video shrinks as described above. 

ff_s31_preproblem.png          https://pasteboard.co/Jea5z1Y0.png	Most of the 
time when I view a youtube video on my Jessie system, it looks like either 
this or the next screenshot.  In this screenshot, notice the absence of the 
list of other videos to the right of the video.  If I move the vertical 
scrollbar, the video shrinks as described above. 

Very occasionally (well, once so far), somehow (magically, I presume), when I 
opened a youtube video on Jessie it looked like the "noproblem" screen shot -- 
in that case, moving the vertical scrollbar was not a problem.

Has anyone here experienced something similar?

This is one set of google searchwords I used: [youtube on firefox image shrinks 
scroll] -- suggestions for better searchwords might be helpful.

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#223877 — Re: Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically

Rh Kramer wrote: 
> Aside: emailing from a different computer -- "Reply to:" will get to the right 
> computer.  (I decided to use pasteboard, didn't wait for a better suggestion 
> -- I hope the images are accessible.)
> 
> Problem with viewing Youtube videos on Firefox version 68.9.0 on Jessie (but 
> not with the same version on Buster (well, at least so far): 

I have not experienced this.

Start with:

    * quit Firefox

    * start firefox from a command line with -P

    * create a new profile

    * does the problem continue? If not, you had a config or
      add-on issue. Go back to your old profile and
      remove add-ons and reset config, or continue here if 
      you prefer.

    * if it still exists: unpack the current Firefox from Mozilla in
      /opt/firefox and run it.

    * does the problem exist here? tell us either way.

-dsr-

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#223884

Thanks, sounds like a plan!

On Monday, June 22, 2020 08:24:23 AM Dan Ritter wrote:
> I have not experienced this.
> 
> Start with:
> 
>     * quit Firefox
> 
>     * start firefox from a command line with -P
> 
>     * create a new profile
> 
>     * does the problem continue? If not, you had a config or
>       add-on issue. Go back to your old profile and
>       remove add-ons and reset config, or continue here if
>       you prefer.
> 
>     * if it still exists: unpack the current Firefox from Mozilla in
>       /opt/firefox and run it.
> 
>     * does the problem exist here? tell us either way.
> 
> -dsr-

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#223888

On Monday, June 22, 2020 11:06:25 AM rhkramer@gmail.com wrote:
> Thanks, sounds like a plan!
> 
> On Monday, June 22, 2020 08:24:23 AM Dan Ritter wrote:
> > I have not experienced this.
> > 
> > Start with:
> >     * quit Firefox
> >     
> >     * start firefox from a command line with -P
> >     
> >     * create a new profile
> >     
> >     * does the problem continue? If not, you had a config or
> >     
> >       add-on issue. Go back to your old profile and
> >       remove add-ons and reset config, or continue here if
> >       you prefer.

Ahh, the problem seems to be gone in a clean profile, so I may spend some time 
in the old profile disabling add-ons and plugins.  (I don't have that many, 
don't know if I have to restart after each -- maybe I'll disable them all, 
restart firefox, and then add the ones I really want back one at a time.

I don't recall doing anything special in the configuration, not sure I made any 
changes at all.  I did block cookies from some sites, I don't think that 
should have an effect.


> >     
> >     * if it still exists: unpack the current Firefox from Mozilla in
> >     
> >       /opt/firefox and run it.
> >     
> >     * does the problem exist here? tell us either way.
> > 
> > -dsr-

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#223898 — Resolved: Re: Firefox shrinks to horizontal bar when viewing youtube video and scrolling vertically

On Monday, June 22, 2020 12:48:49 PM rhkramer@gmail.com wrote:
> Ahh, the problem seems to be gone in a clean profile, so I may spend some
> time in the old profile disabling add-ons and plugins.  (I don't have that
> many, don't know if I have to restart after each -- maybe I'll disable
> them all, restart firefox, and then add the ones I really want back one at
> a time.

Ok, the problem seems to have been due to a plug in named YouTube Plus.

I actually worked the other way, I disabled plugins one at a a time, without 
restarting Firefox.  YouTube Plus was the second one I disabled and the 
problem went away (on a new page with a newly loaded youtube video).

If I had disabled all the plugins with no change, then I would have restarted 
FireFox and then, assuming the problem was gone, start re-enabling plugins one 
at a time.

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