Firefox Community Forum

This is the reply I received from Protonmail: They say the latest version of Firefox caused the issue and is happening on other services as well. We have been using FF exclusively for decades and this is frustrating! Are you in fact working to resolve the issue on your end? Thank you.

Mario M. (ProtonMail) Jun 12, 2026, 16:07 GMT+2

Hello,

Thank you for your messages.

Please note that we are aware of this issue, and our developers are looking into providing a fix from our side. However, the latest version of the Firefox browser caused issue on many other services as well, so they are working on resolving it from their side as well.

I have provided your feedback to our development team. You can contact Firefox directly in order to escalate the issue further.

For the moment you can try using keyboard shortcuts such as CTR: + C and CTRL + V. We appreciate your understanding.

If you have any additional questions, feel free to contact us again. Kind regards,

Mario M. Customer Support Proton Mail

Seafortress27 Jun 11, 2026, 21:47 GMT+2

Hello Mario,

I worked with Google AI for more than one hour troubleshooting this:

Opening a support ticket with Proton Mail Support is absolutely the best move. Since we proved that your clipboard works, your mouse works, and a fresh factory installation of Firefox still experiences the bug, the glitch is entirely on their end.

Proton Mail utilizes a heavily customized web text editor to encrypt messages. When their engineering team updates the background code for this text container, it can inadvertently break standard browser right-click paths—especially for Firefox users. [[1](https://www.reddit.com/r/ProtonMail/comments/p6j0tp/cant_copypaste_text_into_body_of_protonmail_email/), [2](https://www.packtpub.com/en-us/learning/tech-news/hackers-claim-to-have-compromised-protonmail-but-protonmail-calls-it-a-hoax-and-failed-extortion-attempt), [3](https://justinharter.com/an-actually-useful-review-of-proton-mail-vs-fastmail-vs-hey/), [4](https://www.reddit.com/r/ProtonMail/comments/p6j0tp/cant_copypaste_text_into_body_of_protonmail_email/)]

📑 What to Tell Proton Support To help their development team pinpoint and fix the bug faster, reply to your open support ticket with these technical details we uncovered:

- Specify the Browser: State clearly that you are running Firefox and that you just performed a full Firefox Profile Refresh (about:support), ruling out corrupt browser files. [[1](https://support.mozilla.org/en-US/questions/1234222)] - Detail the Extensions: Confirm you tested it with all extensions (including ESET and RoboForm) completely disabled, and the issue persisted. - Identify the Core Bug: Explain that the right-click "Paste" option is stripped only when clicking inside the Rich Text email composition body. [[1](https://proton.me/support/composer)] - Mention the Workaround: Note that Drag-and-Drop text injection works perfectly, meaning the editor container can receive data, but its custom context-menu script is failing to display the native "Paste" command. [[1](https://support.mozilla.org/en-US/questions/1234222)] They will likely log this as a known front-end interface bug and patch it in an upcoming web layout deployment. In the meantime, you can rely on the Drag-and-Drop trick or Ctrl + V to smoothly write your emails! [[1](https://connect.mozilla.org/t5/discussions/right-click-paste-suddenly-stopped-working-in-outlook-email/m-p/34927), [2](https://www.reddit.com/r/ProtonMail/comments/p6j0tp/cant_copypaste_text_into_body_of_protonmail_email/)]

Sent with [Proton Mail](https://proton.me/mail/home) secure email.

Firefox 152.0, latest Windows 11 25H2 update on HP TP01-1036. I have tried just about all the AI fix suggestions but nothing works to fix the following problem:

When viewing the Yahoo.com News page, I scroll vertically down to see each article...one after the other. When I come to an article I want to read, I left click it. The article opens within the present tab and is closed by clicking the red "X " at the upper right hand corner of the article; which in turn, returns me to were I was before opening the article. However, eventually, after a few articles are read, when closing an article, the cursor will jump back to the page's first article instead of bringing me back to where I left off on vertical arrangement of the news articles'? This has been happening for around the last one to two weeks. Nothing else seems to be out of wack.

on some sites, when I try to sign in I have entered my login information, but when I hit enter or submit for instance bigfishgames.com nothing happens. When I am on my Drs portal after I have entered pages of information and hit submit, again it does not get accepted. Soooo, I have to leave firefox and go to a different browser. Any help would be greatly appreciated, it is very frustrating when this happens. It is so frustrating that even though I have been on Firefox for many years I am thinking about using a different browser.

recent firefox update can no longer copy and paste when creating a blog post in Squarespace, I have been using squarespace for around 15 years for my websites and I have never seen this issue, Firefox 15.1 installed and all of a sudden when trying to create a blog post in Squarespace, when I right click a text box pop up and it no longer says paste so I can no longer copy and paste text - this is more than a little annoying, you will not be surprised to know that I am now using Chrome to create my posts, there is no issue in chrome. I am a firefox geek! how can i solve this problem, I just did another update from Firefox, the issue remains I have been using computers for 40 year so I am not a novice but software glitches, I am lost

If I upload a jpg image via the + in the Gemini prompt it fails with an ! or doesn't give the (up pointing arrow) execute option prompt. Do usual things and even clean installed Firefox. Same on 3 windows 11 PCs 2 of which not my own hence not configured the same. All did work until latest updates. No browser extensions antivirus temporarily turned off. Same in, private and safe mode. All work fine on Chrome or Edge (sorry to swear at you) A work around is to load them via Google Drive or Photo and pull them from Google platform.

Unable to upload any images to Gemini. Working fine on all other browsers. Images always fail unless security levels set at lowest. When the do upload the action button does not become active

Content Security policy blocks essential scripts no matter what I do.

It's new Firefox installation, Troubleshoot mode, Enhanced tracking disabled, I'm not on VPN, can log into X.com in another browser just fine.

It's the reason #1 I don't use Firefox. I thought the issue would be fixed but it has been like this for long time.

Yet whatever I do, whatever I turn off this pops up:

Content-Security-Policy: The page’s settings blocked the loading of a resource (default-src) at https://abs.twimg.com/responsive-web/client-web/bundle.Conversation.721fc4aa.js because it violates the following directive: “default-src 'self'”

The screenshot is from Zen, but it uses Firefox and the issue is the same in Firefox.

In Firefox, a lot of my pages are not loading at all...the tab just shows that the website page is loading but it never does. The menus of the website will appear, but pages are not loading. This is not happening in MS Edge. I prefer Firefox, but lately have had to go to MS Edge to load pages. What could be happening?

Hi,

I’m facing an issue with my website’s fine checking tool on Mozilla Firefox. My website is evgfinescheck.com , and the tool works fine in some browsers, but on Firefox it doesn’t load properly and sometimes shows an error.

I am already using the latest (updated) version of Firefox, so the issue is not due to an outdated browser. The tool either fails to fetch data or doesn’t respond as expected when users try to check fines.

I’ve checked basic things like internet connection and browser updates, but the problem still persists specifically on Firefox.

Can anyone guide me on:

What could be causing this compatibility issue? Are there any common JavaScript, API, or CORS-related problems specific to Firefox? How can I debug or fix this issue?

Any help would be appreciated. Thanks!

Hi Everyone,

I've been having this problem for a wee while when I'm browsing facebook (which works better in Chrome) the site on firefox and as well as messenger is really laggy and I'm wondering if there is a hidden setting that I should change to improve this?

I only have adblock addon installed and I cleaned out the history and browser cookies ect but the problem still remains.

Any ideas? Thanks Rob

For a while firefox has been having issues where on youtube in particular when tabs are closed they will continue to play audio for a bit after they are closed. More recently I have closed tabs and the audio keeps on going indefinitely after the tab has been closed. This is on the latest firefox (151.0.4 64 bit) on windows 11.

This only seems to happen with youtube and in general youtube playback is buggy, slow, and lags the whole browser taking several seconds to switch tabs to or from a youtube tab or even close it.

Hi, I have tried all the changes to settings etc but still cannot load certain web pages, i just get a white screen, The pages I cannot load are things like: Facebook Discord Amazon Seller Central Payment screens

This is just a couple I can remember, I have tried other platforms like edge and these sites work fine. Please advise as I would rather use Firefox Thanks Tony

Whenever I search for images on Google, it completely breaks Google search completely. For example, if I search for "bananas" then on the main Results page it has some results and then some sections with drop down menus for more specific questions like "What are the benefits of bananas?" etc. But if I click on the "Images" tab, then it only loads around 6-7 rows of images before failing to load any more, clicking on the images that it does load will not open a website or the typical preview panel, and going back to the main results page from that broken images tab results in none of the drop down buttons working any more.

If I sign out of my Google account completely or even sign into a different Google account, then everything works as normal. If I sign into the same Google account and attempt the same process in a different browser (Edge) then everything works as normal. I initially thought this must be an issue with my Google account since signing out/into a different account caused the issue to disappear, but the I only have this problem specifically on the specific combination of this one particular Google account and the Firefox browser.

I have tried clearing site data, disabling/deleting extensions, and even fully uninstalling and reinstalling Firefox so far and nothing has helped.

The summary says it all, I think. My desktop runs Win 11, Firefox as default browser, synced to all my devices. My emergency backup (very old/slow) laptop runs Win 10, Firefox default browser, synced. I can login to my Etsy account on the laptop. Desktop login attempt, I get an "error occurred" failure. Have emptied cookies/history/rebooted and have changed email & password for account (using laptop) to no avail.

Is there a Firefox setting I should look into on my desktop ?

this new version is horrible. I go to Facebook and it either does not come up or it takes forever. It does it with addons on and off and i do not get half of what i post and there are just colored square no post all when i go to my page but yet it works just fine in Chrome with both extension on and off. I have cleared the cache history etc and still nothing have removed some add ons added some adblockers and it will not let me me see my notifications for at least 5 minutes and that is about how long it takes for it to work on fiirefox with and with out extensions it is a little better with out add ons If this happens with add on you recommend then why do i need them why have and offer theme them if it causes this. have tried contacting Met AI and Facebook but it only happens with Firefox why do this if it aint broke do not fix it

When I hit enter after clicking youtube.com , my screen turns into grey spots where the videos should show and no other written info on screen. What is going on??? I can go in when Safari or chrome.