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Waterfox classic 2019.10 pops up window asking to stop unresponsive scripts instead of showing a message about website slowing it down #1257

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JulianRagan opened this issue Nov 3, 2019 · 7 comments

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@JulianRagan
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Waterfox for some time has been showing an upper bar (similar to the one about blocking popup windows) informing about a webpage slowing it down and offering to stop it.

After updating to Waterfox 2019.10 classic it reverted to the old way of switching to the offending tab and showing a detailed dialog with option to stop an unresponsive script.

@grahamperrin
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grahamperrin commented Nov 3, 2019

Waterfox Classic 2019.10 (20191015002329) on Manjaro Linux at https://github.com/zfsonlinux/zfs/pull/4329 (an extraordinarily long PR) with an extension that's quite hungry in a guest virtual machine throttled to 40% whilst the host machine was busy building software:

Warning: unresponsive script - modal

Home-built Waterfox Classic 56.2.14 (20191007063316) on FreeBSD, the host:

image

A modal dialogue with both versions of Waterfox Classic.

I do vaguely recall occasionally seeing banners in lieu of modal dialogues, but I can't recall whether the banners were in Waterfox Classic.

@JulianRagan
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I have downgraded to 56.2.14 and then to 56.2.12 and I see that this behavior became new-old standard. I had to switch to a second user profile, which was not subject to Waterfox classic 2019.10 update. So I would assume this is due to user settings and not a bug in software. Below is what I meant by the upper bar
SlowDown

Is there some easy way to compare user settings between profiles? I don't see a way to copy all about:config entries into say excel or export to csv.

@grahamperrin
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If it helps: my 56.2.14 screenshot above was of a profile that had never been touched by Waterfox Classic 2019.10.

Where settings are in a .json file (in the root directory of a profile): you can use Waterfox Classic to open and view the file. In the window:

Raw data ▶ Pretty print

– maybe most useful if you need to seek and find a preference.

@grahamperrin
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Refreshed, safe mode:

image

@JulianRagan
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I have found an extension, config export, that lets me export about:config to csv file, but I can't find any difference that would point to this feature (I have been comparing 56.2.14, 56.2.12, 56.2.12 clean profile and 2019.10). So maybe it is not related to browser configuration.

@grahamperrin
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Create a new profile, start it in safe mode and run the test at https://browserbench.org/MotionMark1.1/ – expect slowness (from safety) …

@JulianRagan
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I did create a new profile on Waterfox Classic 2019.10, started it with -safe-mode command line parameter, selected safe mode and got the lovely modal window after a short while.
Modal dialog

So it seems to be random. I think (I am not sure), that at work I have observed both modal dialog and "nonmodal dialog upper bar" in a single session, but at work I am focused on work, so I am not certain of that.

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