First, you are NOT limited to the browser that ships with Mac OS X 10.4.11. Just download a newer browser. I’d recommend TenFourFox, which has the updates and the core of modern Firefox but is compiled by an independent person to still run on OS X. I'm running Mac OS X 10.4.11 'Intel,' TenFourFox doesn't help with that. Whenever I load Firefox it tells me to upgrade to 12.0 for security reasons. 12.0 is most definitely not compatible with the version of OS X on my MacBook Pro. Download Old Version of Firefox for Mac for Mac OS X 10.4 Tiger (Intel).

You need some more RAM, but:

Start by checking if you can run Snow Leopard:

Requirements for OS X 10.6 'Snow Leopard'

OS 10.6 Snow Leopard is once again available from the Apple Store:

and in the UK:

Download Firefox For Mac Os X 10.4 11 C Os X 10 4 11 To 10 5 Free Download

but nobody knows for how long it will be available.

To use iCloud you have to upgrade all the way to Mountain Lion:

Download Firefox For Mac Os X 10.4 11 Pro Max

You can also purchase the code to use to download Lion (Lion requires an Intel-based Mac with a Core 2 Duo, i3, i5, i7 or Xeon processor and 2GB of RAM, running the latest version of Snow Leopard), or you can purchase Mountain Lion from the App Store - if you can run that:

When you have installed it, run Software Update to download and install the latest updates for Snow Leopard.

Download Firefox For Mac Os X 10.4 11 Windows 7

Firefox version 78 is the last supported Firefox version for Mac users of OS X 10.9 Mavericks, OS X 10.10 Yosemite and OS X 10.11 El Capitan. These users will be moved to the Firefox Extended Support Release (ESR) channel by an application update. This will provide security updates until the next ESR update in July 2021, after which the affected users will no longer receive security updates.

While Apple does not have a public policy governing security updates for older OS X releases, their ongoing practice has been to support the most recent three releases. The last security update applicable to OS X 10.11 was made available in July 2018. Unsupported operating systems do not receive security updates, have known exploits and can be dangerous to use, which makes it difficult to maintain Firefox on those versions.

Up until July 2021, we will be updating affected users with critical security updates through the Firefox ESR channel to help retain the best possible security. After this, no security updates will be provided.

If you want to keep your Firefox version up to date, you will need to upgrade your operating system to macOS 10.12 or higher. Older versions that are not supported by Apple are unreliable and unsafe to use, which also makes it difficult to maintain Firefox on those versions.