Firefox Community Forum

Hi everyone, I’m experiencing a browser-specific performance issue with a website called Electrify My Home.

which focuses on home electrification solutions such as heat pump water heaters, heat pump HVAC systems, insulation upgrades, and energy-efficient home improvements. The site loads quickly on Google Chrome, but on Mozilla Firefox it feels noticeably slower, particularly on the first load and when navigating between pages related to heat pump water heaters and other service sections.

I’m trying to understand what might cause Firefox-specific slowdowns, such as differences in JavaScript execution, CSS rendering, font loading, third-party scripts, or browser compatibility. I’d also appreciate recommendations on using Firefox developer tools (like the Performance tab or Network analysis) to diagnose these issues, as well as best practices to improve load speed and overall performance in Firefox without negatively affecting Chrome.

Any insights, debugging tips, or real-world examples would be greatly appreciated.

Fehler: Gesicherte Verbindung fehlgeschlagen

Die Verbindung zu generic.web.de wurde unterbrochen, während die Seite geladen wurde.

   Die Website kann nicht angezeigt werden, da die Authentizität der erhaltenen Daten nicht verifiziert werden konnte.
   Kontaktieren Sie bitte den Inhaber der Website, um ihn über dieses Problem zu informieren.

So scheint ständig bei E-mail Posteingang.?

THE FOLLOWING SHOWED AFTER FIREFOX WAS UPDATED: NO SETTINGS HAVE BEEN CHANGEDTHE BOOKMARKS AND HISTORY SYSTEM WILL NOT BE FUNCTIONAL BECAUSE ONE OF FIREFOX’S FILES IS IN USE BY ANOTHER APPLICATION. SOME SECURITY SOFTWARE CAN CAUSE THIS PROBLEM.

Newly installed FF browser. Tried transferring bookmarks from Chrome to FF using "import bookmarks" menu. Appended .csv file without error but still bookmarks cannot be seen. Tried method two. Using Chrome bookmark manager, downloaded .html file. Used FF again to append without error but the same no bookmarks seen.

Is it really impossible to automatically transfer bookmarks from Chrome to FF?

My bookmarks bar, etc have will not synced with my Firefox even though I ran "sync" several times. I haven't used this laptop in quite awhile, so I had to log in and sync. Also in my themes, a certain creator "MaDonna" has error messages on all of them" Cabin in the Mountains (and all others by her) by MaDonna could not be verified for use in Firefox and has been disabled." In my extensions page, I get the same error message. I am beyond frustrated, I'm also very computer literate, but this mess has me baffled and frustrated :(

I have a Windows Surface Pro 8 and when I set it up, I had no issues with the Syncing or Add ons/Themes/Extensions, everything synced just fine. I have Theme categories set up, and that's not even on the Themes page. I have logged into all of my Firefox/Mozilla accounts. Can anyone help?

Youtube has two settings that must be turned on for captions to show and start automatically when watching a video. "Always Show Captions" and "Auto Play Captions" and not be forced to be signed in to YT. Both settings must be checked off/turned on for captions to work and "set" in the cookies, for captions to work when not signed into YT.

Previously, one could sign in to YT, re-select the settings, refresh browser and then sign out and the captions would work when signed out and viewing YT content.

Since your update today, YT's "auto play captions" option is now missing when using Firefox, but not when using chrome, meaning when using Firefox, it can't be selected while using that browser. The result is that persons who choose to use Firefox instead and don't want to be signed in to youtube, not wanting our information followed in a non anonymous manner, can't use firefox to watch YT and still have captions working without having to constantly turn them on for every single video watched (that's where "auto play captions" came in).

Bad, bad move. On both mozilla's part and YT's.

Laptop Windows 10. Firefox/Mozilla ask me to update. Did that 3 hours ago. Cannot find my History and Bookmarks from prior update. I have restarted my laptop since but still nothing... Can you please help?

I recently upgraded from Windows 10 to 11. Sometime after that I realized that when I go to Firefox Passwords, I am unable to Edit or See the passwords.

I can Delete the password entry in it's entirety. I can Copy the Username.

I cannot Edit the entry. I cannot Copy the Password. I cannot See the Password. I cannot Export Passwords. When I click on those options, nothing happens.

Suggestions?

If I'm not mistaken, between FF146 and FF147 it appears the location of the profile directory has changed. It was:

   /home/<user>/.mozilla/firefox  

and now is

   /home/<user>/.config/mozilla/firefox

Is that correct?

Within the last few days, I have been unable to browse to our vCenter server using Firefox. When I do initially, I get the usual certificate error. Once accepted, I get an error that Firefox cannot connect to the server.

I receive the same error in Private mode as well.

I am able to browse without issue using Chrome which leads me to believe the problem is with Firefox.

Any help would be appreciated.

Immediately after my last Mozilla update, the system asked me if I wanted Firefox as my search engine. I clicked yes, as I always do when prompted. I don't know if this is the cause or if there's another connection I'm missing, but since then I haven't been able to access other websites. Every time I try, an error message appears saying "Oops, the system has crashed..." or something like that. However, if I use Google or Edge, everything works fine. How can I fix this problem? Can anyone help me? Thank you very much in advance.

my e-mail : [edited email from community support forum]

Moi Drodzy pozdrawiam Was Mam wielką prośbę ostatnio byłem zmuszony przywrócić windows 11 z kopii zapasowej i bardzo byłem zdziwiony gdy przy uruchamianiu Waszej przeglądarki wyskoczyło mi okno logowania niestety założyłem u Was to konto bardzo dawno posługując się u wczesnym adresem " condor5@wp.pl " na tomiast w obecnej chwili zastosowałem mój aktualny e-mail " condorhk9@gmail.com " i co się stało : otóż po zalogowaniu ku mojemu zaskoczeniu przeglądarka ukazała mi się w szarych odcieniach a co gorsza cały zasób moich cennych dla mnie zakładek figuruje tam gdzie powinien być ale jest nieaktywny.Czytałem Wasze poradniki ale problem jest chyba innej natury bo jak wspomniałem to co jest szare (stare) jest nieaktywne natomiast można korzystać z pola adresowego i przeglądarka działa.Bardzo mi zależy na tych zakładkach one tam istnieją ale przy próbie ich przywrócenia pojawia się komunikat """ Nie udało się przetworzyć pliku kopii zapasowej. """" Proszę Was o pomoc.

In the past I have had several computers synced together to keep bookmarks the same on each computer. Now I sometimes get the bookmarks but the links on the bookmarks are all changed to other sites. Everything is scrambled. How do I get a couple of my computers all syncing to other computers.

When Firefox opens its first tab, when I enter a site a new (second) tab is opened. From that second tab, sites open in a new tab, or the same tab. But the very first tab remains empty and just takes up space.

What I'd like to see is the first site open in the first tab and then subsequent tabs open in new tabs. I don't have a home page set and don't need it. Is there someplace in settings that can I change this behavior?

My local network is 10.10.10.x and I can't log into my NAS, web server or another computer on the local network... Internet access is fine. Happens on Wi-Fi or Ethernet.

If I access the same web address using Safari or Chrome it works just fine and it used to work before the software update to the 147 build.

So what switch/setting got kicked over during the upgrade that I have to turn off?

These kind of issues really make me mad at the Firefox Dev team... and I'm a very long time user.