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I just upgraded Firefox to version 156.0.2.

It no longer plays mp4 content from a website. It says "No video with supported format and mime type found".

This used to be OK.

I just updated to Firefox Version 157.0 and set up vertical tabs on the left side and love it. I also have "Hide tabs and sidebar" clicked which I assumed would hike the sidebar until I moved my cursor to the left. That doesn't happen. The icons for the various tabs remain displayed. Am I wrong to assume that this setting means the sidebar will be hidden until the cursor is moved to this area?

Thanks for your input.

I cannot seem to revert the changes done to the Firefox User Interface completely. I have set browser.nova.enabled to false, which reverted some changes, but the address bar and the bar of which the websites are (which I do not know the technical name of) are still "squished". Is there a way to fix this? Thank you for your time, -Sargent Venipede

The new, awkwardly rounded tabs are just awful, and on top of that, you can’t change them anymore. Please bring back the old MINIMALISTIC and STRAIGHTFORWARD look of the tabs, I’m begging you. I used Firefox only because of its minimalist style. Why are they forcing this incomprehensible THING on me without the option to choose the visual style myself?(((

When i updated my browser today it showed me a page which said that VPN can be used by clicking on the VPN button in toolbar so i tried to do it but it is not showing in my browser and also it is showing nothing related to VPN in settings.

As of the latest update, the attachment toolbar button in a new mail window does....nothing. Nada. Click it, nothing. I have to drag the attachments from (say) Desktop to the new message window. Works, but...so should the toolbar buttons, which used to.

Tried turning off all addons (i.e., troubleshooting mode) - made no difference.

Exported my Firefox bookmarks from my HP DESKTOP to a flash drive and now need to import them to a new Dell laptop. Installed Firefox on my Laptop and it had a statement that stated import bookmarks. Tried it but didn't work. Both systems are Windows 11. was not logged into Mozilla when it was performed. Plan to use Dell laptop as backup to my desktop computer.

COPIED FIREFOX BOOKMARKS FROM MY HP COMPUTER TO MY DELL LAPTOP BY COPING THE HTML FILE OF BOOKMARKS TO MY DELL LAPTOP DESKTOP SCREEN AND IMPORTED THEM FROM THE DELL LAPTOP DESKTOP AS ADVISED. STILL DID NOT GET ANYTHING COPIED TO THE NEW FIREFOX INSTALLATION EVEN THOUGH IT STATED IT HAD COPIED 827 BOOKMARKS. NOTICED THAT THE FIREFOX SOFTWARE INSTALLED ON MY HP COMPUTER STATED THAT IT WAS WINDOWS 10 INSTALLATION. ORIGINALLY THE HP WAS WINDOWS 10 BUT UPGRADED IT WITH FREE MICROSOFT WINDOWS 11 BUT DID NOT UNINSTALL FIREFOX FROM IT AND REINSTALL FIREFOX AFTER THAT. THEREFORE THE FIREFOX BOOKMARKS ARE FOR A WINDOWS 10 INSTALL ON THE HP COMPUTER AND TECHNICALLY NOT A WINDOWS 11 EVEN THOUGH THE WINDOWS OS HAD BEEN UPGRADED TO WINDOWS 11. SO, I GUESS TO PERFORM THE ACTION I STATED ABOVE TO UNINSTALL FIREFOX ON THE HP COMPUTER AND REINSTALL IT ON THE HP COMPUTER IT IN ORDER TO GET IT TO WINDOWS 11 FOR BOOKMARKS? HOPEFULLY I WON'T LOSE THOSE FIREFOX BOOKMARKS?

After my browser automatically updated to 157.0, when attempting to download files on MacOS 27 (Golden Gate) the download window does not populate but a .part file appears in the default download location.

I was using the "read aloud" function in chat gpt window today and suddenly it started showing me an error message "Unable to read aloud" . It did not affect Chrome. I used many of the troubleshooting recommendations but none worked. troubleshoot mode failed to fix it. private window did not fix it. default change for audio and video did not fix it.

I apologize for the subject line, but there is no better way to describe the problem....

I've been using Thunderbird for a few months now and it has mostly worked well. Then this afternoon I was reading my mail in the Unified Inbox and I noticed something very odd. I had a number of emails showing in the header list with the same "From" and various subject lines. On the face of it, that wouldn't describe any weird behavior except that I noticed the subject lines absolutely didn't match the "From" information.

As I would go to read these emails, the email itself would be correct in the preview pane -- including showing the correct sender name and email -- but the "From" information in the header list pane would still be wrong.

I'm sorry that I can't post a screenshot to make this more clear because there is just too much personal information on screen. But these emails are from several different senders, received by several different email accounts. Everything is correct except that the "From" shown in the header pane is wrong. This is very obvious to me because I normally run entirely in the Unified Inbox with the emails sorted by the "From" information

One example is an email that is actually from "U.S. Department of Veterans Affairs <do-not-reply@notifications.va.gov>" which Thunderbird displays correctly in the preview pane (where I usually read my emails) and if I open the email itself, but the header pane says this email is From "Prepper-co <joshua@prepper-co.com>"

Another example is an email that is actually from "USPS Customer Support <uspscustomersupport@usps.gov>" but the header pane says it is from "Rainier Arms <sales@rainierarms.com" < p></sales@rainierarms.com">

These two examples were received in different email accounts that aren't even on the same server. I have other emails from these same senders that are shown correctly

I found this problem while using 150.0 (64-bit), which said 150.0.1 was available, so I restarted Thunderbird and it updated to 150.0.1 (64-bit) but the problem is the same.

It's very odd. Normally moving an email, say from the Inbox to the relevant year's archive, takes "no time at all".

Which is true for all the mailboxes shown on the attached screenshot, EXCEPT for the four at the bottom. Moving even one message from Inbox to Yiddish can take ten seconds or longer (with the dreaded "Not Responding" occasionally). Moving something in the opposite direction is also screwy, only from those four.

I had thought that it was because they're rather large. This first started when there were just Yiddish and MSW, and I split off most of the earlier years into the archives shown. To no avail.

It's only an annoyance, but I'm puzzled about how such a thing could happen.

Also very slow tagging or untagging a message just in those mailboxes.

Moderator Notes:

• need a performance profile https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance