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Hello Mozilla Community,

I’m currently using Firefox for my web design projects and facing some performance issues when testing websites built with modern frameworks. As a developer at DE IT SOLUTION where we provide website design and development services, I rely on Firefox for testing due to its robust developer tools.

However, I’ve noticed:

Firefox becomes slow when handling multiple tabs with live previews. Developer Tools sometimes lag during real-time CSS adjustments. I would love advice on:

Best practices for optimizing Firefox for web development. Recommended extensions that won’t slow down the browser. Tweaks for faster rendering of web pages during testing. I’ve explored Mozilla’s tips but would appreciate insights from this expert community. Also, if you’re interested in how UX/UI impacts web performance, you might enjoy this article from my experience: Why UX/UI Design Matters in Web Development (Sharing for learning purposes).

Thank you in advance for your suggestions!

Hi

Long-term Thunderbird user and in the past couple of months Thunderbird on my PC on connecting to my mail server goes to a time out (about a minute?) before then downloading new messages. Connecting from my laptop is instant.

The PC - which is relatively new - performs well otherwise.

Checked settings on both and they are identical, save for the laptop.being 64-bit and the PC 32-bit versions.

Any ideas for me to try?

Many thanks

Rick

Firefox hangs after starting with "session restore" After I click yes to restore the session firefox just hangs. So I just went right back using Version 138. I reinstalled from scratch still the same problem. At least the older 138 loads my previous session after hanging for 4 hours about and then everything works normally. The newest Firefox does the same, but NEVER resolves, it just keeps on hanging. Doesnt make any sense. What makes the system restore hang this badly. It cannot be old profiles. I completely renmed the old firefox install directory and cleanly installed firefox and it still does this. so it is not inheriting anything. I also allowed it to create a completely new setup in ./mozilla/firefox in the user account.

It also uses more than 117% cpu constantly during this period. See top entry.

3635 user1      20   0   11.1g 349628 156920 S 117.9   0.1  12:01.89 firefox-bin 

Seems like I have to move to Thunderbird/Seamonkey or Brave. Since 2019, Firefox became very "strange"

System: NAME="MX" VERSION="21.3 (Wildflower)" ID="mx" VERSION_ID="21.3" PRETTY_NAME="MX 21.3 (Wildflower)" ANSI_COLOR="0;34" HOME_URL="https://mxlinux.org" BUG_REPORT_URL="https://mxlinux.org" PRETTY_NAME="MX 21.3 Wildflower" DISTRIB_ID=MX DISTRIB_RELEASE=21.3 DISTRIB_CODENAME="Wildflower" DISTRIB_DESCRIPTION="MX 21.3 Wildflower" PRETTY_NAME="Debian GNU/Linux 11 (bullseye)" NAME="Debian GNU/Linux" VERSION_ID="11" VERSION="11 (bullseye)" VERSION_CODENAME=bullseye ID=debian

Hi, I think there is a connectivity or audio code problem because when I'm using YouTube on Firefox browser there is a crackling sound on all videos (I am using smartphone and Bluetooth headphones). On Chrome, it is not present. Please fix it.

I need help on getting.back to the spot I was at .it like I get ready to go back to were I was at.and sometimes there is so many buttons.and things til it will overwhelm you.so there needs to be one button to push and get u back to that spot.like on u tube there isn't a spot to wher8e u can it in your play list unless you mess with it so by then you can't get back to the song..are u end up looking for another song are having to re program the song on utube.because it's easy to lose the song by accidentally touching the wrong button.

Latest update of Firefox 64, glitch is with attachments to Outlook Emails, cycles trying to open attachments for hours, cannot add attachments to emails. I'm using Chrome now because you software has problems. Help to get back to using FireFox.

This mandatory upgrade completely illustrates the point of why so many never did. Upgrades tend to lose functionality- add-ons, etc, that we're accustomed to and still work quite well with don't function anymore with browser upgrades, and there's no viable replacement available so we stick with what works and find other ways to compensate for any perceived vulnerabilities. Now, like Microsoft, you're forcing consumers to do things they never wanted to and taking away the reasons for using this browser to begin with. Given that we've been able to use older versions for years with no issues, there's no sugarcoating that this is all on you, Mozilla. Calling this course of action disappointing is a gross understatement and nothing more than keeping things polite.

Firefox has recently become unreadable--it is blurry, then clear, blurry, then clear. It has become unusable. I've moved on to Edge. After much research, it is apparent that this is a problem unique to Firefox, who hasn't bothered to address or correct this issue. No more Firefox for me:(

Has anyone else noticed that the memory leak issues have gotten way worse since last update?

I work on a potato. Most of the memory is in the windows paging file, on a mechanical hard drive. So freeing up used memory takes longer than it would on a machine with a metric tonne of quad-channel RAM. The past 6 months, Firefox has started having memory leak issues, where it just uses more & more memory until the paging file hits its hard limit and windows kills firefox.

But since last update (135.0 x64), the memory leak issue has worsened significantly.

If I open firefox, and then tab between all current tabs, I get maybe 5 GB of memory usage. So even if all tabs are marked as "active" and loaded into memory, this still isn't enough to cause issues.

But after 30 minutes, that memory usage has ballooned up to >20 GB, at which point windows decides that it needs to free up memory, and kills the process. Which is annoying, because then the browser reverts to the last saved state, meaning many tabs can be lost or reset to several clicks back.

I've tried shaving off extensions, with zero change. I've tried increasing paging file size, but that's just kicking the bucket down the road.

Anyone have a solution to this?

Firefox web browser when utilizing its online advertising is attempting to install malware(addons.browse-privately.net [URL:Malvertising]). [P.S. My antivirus is up-to-date!] My Avast Security software catches and stops it. In addition, whenever I start Firefox the session which was saved from previous use opens along with an additional instance briefly. ???