User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:88.0) Gecko/20100101 Firefox/88.0

Steps to reproduce:

Visit https://www.academia.edu/11829077/Early_Trench_Tactics_in_the_French_Army_The_Second_Battle_of_Artois_May_June_1915?auto=download

Actual results:

Get hit with painful pulsing animation on the right side, screenshot attached.

Try to inspect element, but right-click menu never appears.

Expected results:

Right-click menu should appear, so users can inspect element, so users can identify the cause of any pain/animation.

I'm not currently using layout.frame_rate 1 because it's a pain to turn that setting on and off. But it would probably block this animation.

Hi MarjaE , on What Operating system are you seeing this ? I tried on Windows 10 as well as Mac but I cannot reproduce this issue, the page loads without issues and on the right side I'm seeing a few ads but nothing with that loading animation, also The Context menu is displayed for every item on that page. I will attach a screen recording , maybe you can point something out that I might be missing ?

I apologize for the screen shaking when inspecting an ad, it seems the page tries to scroll when devtools opens.

MacOS 10.14.6, with Reduce Motion, on Firefox 88 with various safety fixes to block animation, increase font sizes, etc.

Still broken, still migraine-inducing for me.

It's also just as bad in Troubleshoot Mode.

The site can open with at least 3 different layouts, so it's hard to reproduce.

1. Article in most of the screen, text unreadable small, sidebar on one side.

2. Article in most of the screen, text unreadable small, pain/animation on right side, which is the version I've reported above.

3. Article in full screen, text corrupt but readably sized, no sidebar or animation.

4. Article in full screem, text unreadably small.

@MarjaE does this happen on any other websites, or just this site in particular?

If you navigate to about:config and view your modified preferences, do you have anything set?

No and yes, respectively.

For example

accessibility.typeaheadfind.flashBar 0

browser.stopReloadAnimation.enabled false
browser.tabs.warnOnClose false

font settings such as

font.language.group x-western
font.minimum-size.x-cyrillic 20
font.minimum-size.x-unicode 20
font.minimum-size.x-western 20
font.name.monospace.x-cyrillic Andika
font.name.monospace.x-unicode Skeirs
font.name.monospace.x-western Andika

general.autoScroll false
general.smoothScroll false
general.smoothScroll.mouseWheel.migrationPercent 0

image.animation_mode none
layout.spellcheckDefault 0
lightweightThemes.usedThemes []
media.autoplay.block-event.enabled true
media.autoplay.blocking_policy 2
media.autoplay.default 5
media.block-autoplay-until-in-foreground false

media.videocontrols.picture-in-picture.video-toggle.enabled false

print.tab_modal.enabled false

toolkit.cosmeticAnimations.enabled false
toolkit.legacyUserProfileCustomizations.stylesheets true
toolkit.scrollbox.verticalScrollDistance 20

ui.caretBlinkTime 0
ui.prefersReducedMotion 1
xul.panel-animations.enabled false