Are there any of the older browsers we can be using right now?

Question

I know from the past, we've used older versions in times , there were problems. I would like to know which ones to use that work good, and are safe.There's been so many browsers over the years, I'm not sure which ones to try. Thank You.
"application": {
"name": "Firefox",
"version": "24.0",
"userAgent": "Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20100101 Firefox/24.0",
"supportURL": "https://support.mozilla.org/1/firefox/24.0/WINNT/en-US/"
"modifiedPreferences": {
"browser.cache.disk.capacity": 358400,
"browser.cache.disk.smart_size.first_run": false,
"browser.cache.disk.smart_size.use_old_max": false,
"browser.cache.disk.smart_size_cached_value": 358400,
"browser.places.smartBookmarksVersion": 4,
"browser.startup.homepage_override.mstone": "24.0",
"browser.startup.homepage_override.buildID": "20130910160258",
"dom.mozApps.used": true,
"extensions.lastAppVersion": "24.0",
"network.cookie.prefsMigrated": true,
"places.history.expiration.transient_current_max_pages": 20118,
"places.database.lastMaintenance": 1381199361,
"plugin.importedState": true,
"plugin.disable_full_page_plugin_for_types": "application/pdf",
"privacy.sanitize.migrateFx3Prefs": true,
"storage.vacuum.last.places.sqlite": 1380244034,
"storage.vacuum.last.index": 1
"graphics": {
"numTotalWindows": 4,
"numAcceleratedWindows": 0,
"windowLayerManagerType": "Basic",
"windowLayerManagerRemote": false,
"numAcceleratedWindowsMessage": [
"tryNewerDriver",
"9.6"
"adapterDescription": "RADEON 9200 PRO Family (Microsoft Corporation)",
"adapterVendorID": "0x1002",
"adapterDeviceID": "0x5960",
"adapterRAM": "Unknown",
"adapterDrivers": "ati2dvag",
"driverVersion": "6.14.10.6462",
"driverDate": "3-23-2004",
"adapterDescription2": "",
"adapterVendorID2": "",
"adapterDeviceID2": "",
"adapterRAM2": "",
"adapterDrivers2": "",
"driverVersion2": "",
"driverDate2": "",
"isGPU2Active": false,
"direct2DEnabled": false,
"directWriteEnabled": false,
"directWriteVersion": "0.0.0.0",
"direct2DEnabledMessage": [
"tryNewerDriver",
"10.6"
"webglRendererMessage": [
"tryNewerDriver",
"9.6"
"info": {
"AzureCanvasBackend": "skia",
"AzureFallbackCanvasBackend": "cairo",
"AzureContentBackend": "none"
"javaScript": {
"incrementalGCEnabled": true
"accessibility": {
"isActive": false,
"forceDisabled": 0
"libraryVersions": {
"NSPR": {
"minVersion": "4.10",
"version": "4.10"
"NSS": {
"minVersion": "3.15.1 Basic ECC",
"version": "3.15.1 Basic ECC"
"NSSUTIL": {
"minVersion": "3.15.1",
"version": "3.15.1"
"NSSSSL": {
"minVersion": "3.15.1 Basic ECC",
"version": "3.15.1 Basic ECC"
"NSSSMIME": {
"minVersion": "3.15.1 Basic ECC",
"version": "3.15.1 Basic ECC"
"userJS": {
"exists": false
"extensions": [
"name": "Troubleshooter",
"version": "1.1a",
"isActive": true,
"id": "[email protected]"
"name": "avast! WebRep",
"version": "7.0.1474",
"isActive": false,
"id": "[email protected]"
"name": "DnsBasic",
"version": "1.0",
"isActive": false,
"id": "{650EED71-89E2-453B-8DCF-2AA1B4AE6EF3}"
"name": "KnowtheBible",
"version": "5.24.1.48262",
"isActive": false,
"id": "4lffxtbr@BibleTriviaTime_4l.com"
"name": "Microsoft .NET Framework Assistant",
"version": "0.0.0",
"isActive": false,
"id": "{20a82645-c095-46ed-80e3-08825760534b}"
''merged old thread details with thread. -mjb''

Answer 1

As already posted, best is always to identify and solve problems instead of downgrading to older Firefox versions.
Only the Firefox 17 ESR and Firefox 24 ESR versions in the future can be considered as older Firefox versions as long as they are supported with security updates.
*http://www.mozilla.org/en-US/firefox/organizations/all.html
All older Firefox versions have security issues that make you vulnerable to malicious websites.
If websites only work with older Firefox versions and not with the current release then best is to use a portable Firefox version only for those websites and use the current release for all other websites to be protected as good as possible.<br />
The portable version comes with its own profile folder and doesn't interfere with the currently installed release version.
*http://portableapps.com/apps/internet/firefox_portable
*http://portableapps.com/apps/internet/firefox_portable-esr
*http://portableapps.com/support/firefox_portable#helper_apps