WAOW bad update

I have browsed the portableapps archive and I have found the latest Firefox 54.x

54.0.1

It works like a charm

so the issue is coming from 55.x

Can you provide a link to the affected page, or is a login required?

Your report is similar to another report this morning, except your select controls are not trying to display 1000+ options. Firefox on Windows hangs with large bootstrap drop downs

Since Firefox 55 was released about a month ago, it's odd to get these two reports on the same morning. I wonder if something else has changed that is shared across the two computers or web applications?

Hello jscher2000 the select drop down list has standard html,

I mean it is previously generated by a MySQL query, so when the php has output it, it is common HTML

Ouch I have seen right now.

The heavy select list, is the selection of canned replies (it is a ticket system)

Checking the HTML source code with Ctrl-U

I see that the coder used this schema

option value --> either very long text, since is the text of the canned reply and between the two option tags, the string that we can find in the drop down list

so it happen that there is a very big amount of text in every entry of this drop down list for the part value="text text text text....."

since the "text text text text....." is some tenths of words

But that is perfectly handled by any browser .... either Firefox itself... but as stated above, up to version 54.0.1

Since are our canned replies, and the ticket is under pssword, there are two reasons to avoid sharing the link

BUT

Maybe I can prepare a PURE VANILLA HTML clone of that HTML and simulate with a lorem ipsum text

If the behaviour is confirmed, at that point I can share the link of that dummy page

Could you check on this in Firefox 55:

Are you using Multiprocess (e10s)?

Multiprocess creates a second firefox.exe or plugin-container.exe process to isolate the web content from the browser UI. In Firefox 54 and later, you may see four content processes. You can check whether you have this feature turned on as follows. Either:

• "3-bar" menu button > "?" button > Troubleshooting Information
• (menu bar) Help > Troubleshooting Information
• type or paste about:support in the address bar and press Enter/Return

In the first table on the page, check the row for "Multiprocess Windows" and see whether the number on the left side of the fraction is greater than zero. If so, you are using e10s.

If you are using e10s:

To help evaluate whether that feature is causing problems, you could turn it off as follows:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste autos and pause while the list is filtered

(3) Double-click the browser.tabs.remote.autostart.2 preference to switch the value from true to false

Note: the exact name of the preference may vary, but it will start with browser.tabs.remote.autostart

At your next Firefox startup, it should run in the traditional way. Any difference?

If you do mean Task manager, with Firefox 54.0.1 I see just one and only Firefox.exe running

while in fact , with Firefox 55.x I noticed that the Firefox.exe processes where many either four

Yes I confirm that they are three

Hello

tested the

(3) Double-click the browser.tabs.remote.autostart.2 preference to switch the value from true to false

no change, still lags.

After the change from true to false, now the Firefox.exe processes are two.

Maybe it is better to highlight that at home and in the company we have various PCs quite all with Windows 7 x64 and a couple with Windows 10 and some few with Windows 7 x32

The problem appears only on those with Windows 7 32 bit

I think the 32-bit version of Firefox runs the same code on 32-bit processors as 64-bit processors, but if your 64-bit Windows now has the 64-bit version of Firefox, that might behave a little differently. There probably are a lot of subtleties we (support volunteers) don't know about in that area because until recently it was very rare for users to run the 64-bit version of Firefox because you had to go out of your way to find it.