求助：Gmail网页端无法新建及回复邮件，多浏览器环境下问题复现

Hey there, let’s tackle this Gmail issue you’re facing—can’t create or reply to emails sounds super frustrating, especially when you’re getting back to using email regularly. Let’s walk through some targeted fixes tailored to your setup (Firefox on Windows, both private browsing and ESR version):

1. Disable all extensions (including security-focused ones) #

You mentioned using similar security extensions, and conflicts here are a common culprit:

• For regular Firefox windows: Click the menu icon in the top-right → Add-ons and themes → Extensions, then temporarily disable all extensions. Restart the browser and test Gmail again.
• For private browsing windows: Private mode might still load some extensions by default. Go to Menu → Settings → Privacy & Security → Private Browsing and Isolation, check "Disable all extensions in private browsing windows", then reopen a private window to access Gmail.
• For Firefox ESR 52.6: Head to the extensions management page the same way, disable all security extensions, and see if the issue goes away.

2. Clear Gmail-specific cache and site data #

Outdated cache can break Gmail’s interface:

1. Open Firefox and go to the Gmail page
2. Click the lock icon left of the address bar → Clear Cookies and Site Data
3. In the popup, only select entries related to mail.google.com, then click "Clear"
4. Restart your browser and check Gmail again

3. Reset Firefox settings (keep bookmarks/passwords) #

If the above doesn’t work, resetting settings can rule out misconfigured browser settings:

• Open Firefox’s menu → Help → More Troubleshooting Information
• Click the "Refresh Firefox" button in the top-right, follow the prompts. This resets the browser to default but keeps your bookmarks, passwords, and history.
• After resetting, don’t reinstall extensions right away—test Gmail first. Then add extensions one by one, testing after each to spot any conflicting ones.

4. Check Firefox version compatibility #

Firefox 56.02 and ESR 52.6 are quite outdated, and Gmail may have dropped full support for these versions:

• Consider upgrading to the latest Firefox ESR release (ESR is designed for stability and long-term support, perfect for enterprise use). Newer versions fix compatibility issues and improve security.
• Pro tip: Back up your bookmarks, passwords, and extension settings before upgrading to avoid data loss.

5. Test alternative browsers or Gmail’s basic HTML version #

To rule out account-wide issues:

• Try accessing Gmail in Chrome or Edge—if it works there, the problem is definitely tied to your Firefox setup.
• Use Gmail’s basic HTML version by visiting https://mail.google.com/mail/u/0/h/—this stripped-down version has better compatibility with older browsers, so it might let you create/reply to emails while you fix the main issue.

内容的提问来源于stack exchange，提问作者YetAnotherRandomUser