Hi it could be Google Container, Privacy Badger, uBlock Origin blocking a cookie that is needed. Or it is possible it is your Security Software which is ? ?

Please try : SAFE MODE

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

In Firefox Safe mode these changes are effective:

• all extensions are disabled (about:addons)
• default theme is used (no persona)
• userChrome.css and userContent.css are ignored (chrome folder)
• default toolbar layout is used (file: localstore-safe.rdf)
• Javascript JIT compilers are disabled (prefs: javascript.options.*jit)
• hardware acceleration is disabled (Options > Advanced > General)
• plugins are not affected
• preferences are not affected

TEST''''is issue still there ?

Pkshadow said

Hi it could be Google Container, Privacy Badger, uBlock Origin blocking a cookie that is needed. Or it is possible it is your Security Software which is ? ? Please try : SAFE MODE

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

In Firefox Safe mode these changes are effective:

• all extensions are disabled (about:addons)
• default theme is used (no persona)
• userChrome.css and userContent.css are ignored (chrome folder)
• default toolbar layout is used (file: localstore-safe.rdf)
• Javascript JIT compilers are disabled (prefs: javascript.options.*jit)
• hardware acceleration is disabled (Options > Advanced > General)
• plugins are not affected
• preferences are not affected

TEST''''is issue still there ?

I tried, but unfortunately it didn't work. I did notice that the first couple of seconds or so, it loads normally. Then, "Working..." shows up, and then the spacing issue happens. I wondered if it could be a specific sheet, but all of them have the same behavior.

Ya, Google is a fan of Firefox for sure.

Did not answer What Security Software you are using : There is security software like Avast/AVG, Kaspersky, BitDefender, ESET and sometimes McAfee HTML Page scanners can cause issues :

• https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message#w_avast-and-avg-security-products

Are you using or changed anything to do with Fonts in Firefox ? Also keep in mind those Extensions.

Please try this : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 61.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.

Oh, sorry! It's super late here, and I meant to include that. I'm not using anything beyond Windows Defender on Windows 10 (Surface Pro 4, with the latest updates). I'll try reinstalling tomorrow.

Full context: I installed Firefox yesterday, but only really moved everything into it today. That's when I went to Google Sheets and saw the problem, and it seems to happen with only "v" and "e". Disk Cleanup shouldn't take too long because I did it last week.

Also, no changes to fonts or their settings remain active. Before making this post, I tried several possible fixes, but as they didn't work, I reverted them.

Just curious - does it happen to you? If you go to Google Sheets, type "have" in a cell and press enter, does it look like that?

Additionally, now that I'm thinking about could it be a driver issue? Again, this is a Surface Pro 4, with an Intel onboard GPU. I have the latest drivers. But I'm not sure if that interferes somehow.

Pkshadow said

Ya, Google is a fan of Firefox for sure.

---

Did not answer What Security Software you are using : There is security software like Avast/AVG, Kaspersky, BitDefender, ESET and sometimes McAfee HTML Page scanners can cause issues :

• https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message#w_avast-and-avg-security-products

Are you using or changed anything to do with Fonts in Firefox ? Also keep in mind those Extensions.

Please try this : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 61.0.2 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.

Tried reinstalling and also didn't work. Any other suggestions?

Also, I just noticed that this problem occurs specifically with the Arial font only. But I can't switch fonts because I'm working on a team, and the default font we're using for the sheets is Arial. And it only happens when the page finishes loading.