Troubleshooting
- How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites
- How to troubleshoot time related errors on secure websites
- How to troubleshoot "Your connection is not secure" error codes on secure websites
- How to unpin Firefox from the taskbar in Windows 10
- How to use Java if it's been blocked
- How to View and Manage Saved Articles in Pocket for iOS
- Hyperlinks in Messages Not Working
- I can't find Firefox Focus in Germany, Austria or Switzerland
- I can't import Facebook contacts on the ZTE Open sold on Ebay
- I can't install Facebook Container on Firefox 57+
- I can’t play audio on a Remote Desktop Connection
- I can't play videos or audio on Firefox for Android 5.0 (Lollipop)
- I can't take screenshots of some websites on Firefox Lite
- I can't take screenshots of some websites on Firefox Rocket
- I can't take screenshots of some websites on Firefox Rocket Redirect 1
- I can't take screenshots on Firefox Klar
- I can’t watch YouTube videos fullscreen on Firefox Lite
- Identify problems caused by third-party modules in Firefox for Windows
- I forgot my password for Firefox Account and I can't log into Firefox Relay
- I forgot my password for Firefox Account and I can't log into the VPN
- I forgot my password for Firefox Account and I can't log into the VPN or Private Network
- I forgot my password for Mozilla account and I can't sign in to Firefox Relay
- I found a fake Firefox update
- Ignoring threads
- Ignoring threads Redirect 1
- I just missed a picture in the Gallery slideshow - how do I get back to it?
- I just missed a picture in the picture slideshow - how do I get back to it?
- Images or animations do not show
- I'm having problems with some websites when I use Firefox Private Network
- I'm having problems with some websites when I use Firefox Private Network Redirect 1
- I'm having trouble logging into Pocket. Can you help?
- I’m having trouble signing into Mozilla VPN with my Firefox account Redirect 1
- I'm having trouble signing up for Pocket. Can you help?
- I'm having trouble with the events platform
- Import Facebook contacts on ZTE Open sold on Ebay
- Importing Facebook contacts on ZTE Open sold on Ebay
- Importing your links into Pocket Redirect 1
- Inbox or Other Folder Full
- Indian sites display incorrectly
- I never set a Pocket password. How can I create one?
- Installing and Using another Language Dictionary
- Installing Pocket for Android and Kindle Fire via direct download
- Installing Pocket for Android and Kindle Fire via direct download Redirect 1
- I see SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED for HTTPS sites in Firefox
- Is my Firefox problem a result of malware
- I've lost Firefox Sync account information
- I've lost my Firefox Sync account information
- I've lost my Firefox Sync account information - What to do
- I've lost my phone — how do I deactivate Sync?
- Java Deployment Toolkit Blocked
- Java plugin blocked for your protection
- Java-related issues
- Joining public WiFi while on Mozilla VPN
- Lastpass was disabled after updating Firefox
- Links do not open in Firefox
- Links to local or network pages do not work
- List of Pocket service vendors
- Lockwise losing login information after Firefox update
- Lockwise losing login information when upgrading Firefox version
- Login has been disabled for my account
- Lost Bookmarks
- Manage your Monitor notifications
- Managing Thunderbird Updates
- Marketplace for Firefox OS 1.1
- Marketplace won't load on my Firefox OS device
- Master password requested but not set
- Master password requested but not set Redirect 1
- Memory constraints, Firefox performance and Firewalls
- Menu bar is missing
- Microsoft OAuth Authentication and Thunderbird in 2023
- Microsoft OAuth Authentication and Thunderbird in 2024
- Missing vertical scroll bar
- Mobile Support tagging guidelines
- Mobile Support - Tagging guidelines
- Monitor status indicators
- Mouse buttons do not work as Back and Forward
- Mozilla Crash Reporter
- Mozilla Crash Reporter Redirect 1
- Mozilla Crash Reporter TB
- Mozilla Crash Reporter TB Redirect 1
- Mozilla Social FAQ
- Multiple tabs open when starting Firefox
- Multi-touch does not work
- My default search engine changed after updating Firefox
- My default search engine changed after updating Firefox to version 98
- My default search engine changed after updating Firefox to version 98 Redirect 1
- My Mac won't shut down after updating to Firefox version 45
- My Mac won't shut down after updating to Firefox version 45 Redirect 1
- My sign in was “blocked for security reasons” on Mozilla account
- Names but no Email Addresses are Displayed
- Navigation buttons like back, home, bookmarks and reload are missing
- Netflix, Hulu, Disney+ or Prime error after installing Firefox version 84 on Mac
- New Adobe Flash Player Distribution
- New in Thunderbird 31.0
- New in Thunderbird 38.0
- New in Thunderbird 45.0
- New in Thunderbird 52.0
- New in Thunderbird 60
- New in Thunderbird 91
- New tabs do not appear to the right of the last tab