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Hi everyone!

I am using the add on 'sidebery' for vertical tabs.

Recently I updated to FF 157.0 and saw this annoying part in the sidebar (as seen in the image attached "started like that...")!

I didn't ask for taking up THAT much space in the sidebar area that could fit almost TWO vertical tabs in it! Can you (or I?) somehow make it go away completely?

The userChrome.css 'trick' with sidebar-header #sidebar-box {

  display: none !important;  

} didn't do it.

...

So...Fast forward and another update took place (158.0) and looking at the attached image ("now..."). That space needs to be GONE for good. Like it was before. And not with a label tacked on top. :)

Can you make go away?

Cheers!

Where do extensions generally store their data. EG Tab Session Manager. In this case there is a tab for storing backups but nothing is said about where the basic data is stored.

I assume it's somewhere in the profile info, but the files generally have impenetrable names. Most of the extension devs aren't easy to contact.

MacOS 15.8.3. Firefox 160.0

I use Firefox and Adblock Plus on my laptop. I have it turned off for Fox News. I am getting a banner that says "allow adds on Fox News". To work around this problem I turn Adbloclk Plus on and off three times then I get a banner that says "Continue without Supporting". This only works for three or four articles and the cycle starts all over again. Can anyone help with this problem?

Hello, I am having trouble syncing my calendar and address book between my phone (Samsung S23) and Thunderbird on my computer. It seems that the 'My Phone Explorer' add-on does not support the latest version of Thunderbird (version 160). Please help me. Best regards, Leif Abrahamson leab9@yahoo.se

I have NordPass running in my Google Chrome Browser. I would like to have NordPass also running in my Firefox Browser. I would like NordPass in Firefox to make use of/access all the data already stored in the Google Chrome NordPass program. How do I accomplish this?

I'm trying to install a recommended add-on called Ghostery, but I keep getting the message, "Download failed. Please check your connection." This is happening with all add-ons even though I am connected to the internet.

Today, while I was using my browser, I got notifications that several extensions I regularly use had been uninstalled - and that was only from the extensions which usually provide that info on being uninstalled!

Uninstalled were: - Tampermonkey - Browsec VPN (what I use when Mozilla VPN is unstable) - Stylus (which I use to make several sites usable/navigable) - Tumblr Outbox (wiping all saved outgoing ask messages I'd previously had saved!) and

Worst of all - ONETAB

Which had ~1000 tabs saved in it!

I couldn't find a way to recover OneTab as-was, so I was left with the option of reinstalling it which, according to the Devs, means that any recoverable data IS lost at that point.

So I want to know which bright spark's idea it was to randomly uninstall people's extensions for no given reason, especially when they're ones for which recovery is difficult to nigh-impossible.

I want to know who did this, why they did this, and what can be done to fix it, because a number of those saved tabs were for work. Others were for personal projects. Usually Firefox bundles this kind of thing in with an update and it usually fixes if you reload the browser - no dice today. So I want to know if I can just expect this kind of meddling going forwards or if I should start searching for a different browser entirely.

I came to Firefox to avoid Chrome nonsense. If I'm going to experience this, why would I continue to pay for the VPN or use the browser?

Using Win.11, FF 160.0 Bitwarden 2026.10.2 Malwarebytes 3.3.9 The above 2 extensions do not play well together. When Malwarebytes is active, Bitwarden does not operate properly even if Bitwarden.com is excluded from Malwarebytes. Sometimes, Bitwarden does not open at all, or I get the uploaded image.

I have been trying to use Rakuten which has been working fine. For the last few weeks I have been getting this message for all web sites I visit: Your ad blocker is working too hard! To earn Cash Back at [all web sites I visit], disable your ad blocker and refresh this page.

Hi,

I've started experimenting with Vibecoding some extensions for myself.. But I keep hitting a problem where TB reports back that folders are stale.

Specifically I'll hit something like this:

[Exception... "Component returned failure code: 0x80550005 (NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE) [nsIMsgFolder.messages]" nsresult: "0x80550005 (NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE)" location: "JS frame :: resource:///modules/ExtensionMessages.sys.mjs :: getMessagesInFolder :: line 925" data: no] ExtensionMessages.sys.mjs:928:13 [Exception... "Component returned failure code: 0x80550005

Usually when I go look at these folders in the UI, the total-email-count for the folder in blank, but the Size of the folder will show >1kb (eg .. something greater than zero). If I click on the folder, TB updates the summary file and all is well, for a while.

Some folders do report as no messages, and "blank" for file size as well.. but those seem to be genuinely empty.

These types of issues are causing pain in several extension ideas I've had, and I can't seem to figure out a way to handle them.

For example: I had an idea to create and extension to delete empty folders. The original version would encounter these NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE folders, and then just wipe them out as TB told the extension there were no emails in it. I found this out a little too late for some folders..

Another idea was to create and manage Virtual Search folders automatically. But I've hit a similar issue there with this staleness and had to skip such folders.

I've tried to get the extensions to trigger rebuilding summary files when we hit this error, but that never seems to do the job. The only method I've found is to open the folder manually in TB. Sometimes I'll find that starting a Search across the folders also helps - but that also tends to bail out unexplained.

I'm working with a lot of emails and folders..

If anyone can help explain why TB "forgets" whats in a folder, and how to trigger a summary-rebuild for a specific folder I'd be interested in hearing it.

Thanks

trying to install an add-on by file and I have turned off the signature thing, I also reinstalled firefox but the same issue keeps happening. it was able to install correctly on the zen browser which I think is built on firefox but idk.

I don't have an icon for ublock, how do I get one so that I can monitor my usage. If I go into Firefox extensions it says downoaded and working. it doesn't show as an app in "my apps"

Hello, I am trying to find extension " IBM Security Rapport " for firefox. It's now showing up on the Firefox extensions list. I appreciate any help you can provide.

thank you